Lobe finned fish include the ancestors of

Answers

Answer 1

Answer:

The Sarcopterygii, or lobe-finned fishes, is a clade containing the coelacanths, lungfishes, tetrapods, and their fossil relatives, including the osteolepiformes and panderichthyids. They are the sister group to the ray-finned fishes (Actinopterygii), together forming the bony fishes (Osteichthyes).

Explanation:

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Answer 2

Lobe-finned fish were ancestors to amphibians and consequently to reptiles, birds, and mammals. The two surviving groups are coelacanths and lungfish, which have fins with bone and muscle, foreshadowing the limbs of terrestrial vertebrates.

Lobe-Finned Fish and Their Descendants

Lobe-finned fish, which fall under the clade Sarcopterygii, are known for their distinctive fins that are fleshy and lobed, supported by bone. Some of the ancestral lobe-finned fish gave rise to forms that eventually evolved into modern tetrapods. These tetrapods include groups such as amphibians, reptiles, birds, and mammals. Unlike their cousins, the Actinopterygii or ray-finned fish, which include species like tuna, bass, trout, and salmon, lobe-finned fish have a richer evolutionary history that traces back to the early evolution of these significant land vertebrates.

The two groups of lobe-finned fish that have survived to the present day are the coelacanths and the lungfish. Originally thought to be extinct, coelacanths made a spectacular re-emergence in scientific awareness when a living specimen was discovered off the east coast of Africa in 1938. Lungfish are found in various places around the world, including Africa, South America, and Australia. Both groups exhibit the characteristic stump-like appendages of bone and muscle in their fins that served as the evolutionary precursor to the legs of amphibians and lungs.


Related Questions

What was Thomas hunt Morgan‘s main contribution to science

Answers

He discovered that certain traits are linked to the X and Y chromosomes. He also created the first white-eyes female Drosophila

Kim has a poor appetite and has lost a severe amount of weight in the past few months. She is unable to concentrate or make decisions. She no longer wants to live and wishes to die. Psychologists are most likely to diagnose Kim with:

Answers

Answer:

Depression

Explanation:

Everything happen to Kim could be treatment.. There is no reason to die. She needs to be strong to avoid the negative things that impact her thinking..Try to be happy, exercise and have good friend... If she keep doing the nice things , the good thing will come to her. I hope this partial ideas will help her to overcome this difficult time.

Final answer:

Psychologists would likely diagnose Kim with major depression, as her symptoms include significant weight loss, poor concentration, and suic-idal ideation.

Explanation:

Given the symptoms described, psychologists are most likely to diagnose Kim with major depression. Major depression is characterized by a combination of symptoms that can include significant weight loss (when not dieting), difficulty concentrating, su-icidal ideation, and a general loss of interest in daily activities or life. These symptoms align with what Kim is experiencing: poor appetite with severe weight loss, an inability to concentrate or make decisions, and an explicit desire not to live. It's crucial for someone with these symptoms to seek professional help, as these are signs of a serious psychiatric condition that requires intervention.

Furthermore, the urgency of the situation is heightened because thoughts of suic-ide or self-harm are present. Su-icide risk is elevated among individuals with major depression, and immediate support from mental health professionals is often necessary to ensure the safety and well-being of the person affected.

During a chemical reaction, which of the
following does the arrow stand for?
A. relates
B. copies
C. yields

Answers

Answer:c

Explanation:

During any chemical reaction, arrow stand for yields. The correct option is C.

What is a chemical reaction?

A chemical reaction is a process that converts one or more substances, known as reactants, into one or more different substances, known as products. Chemical elements or compounds are examples of substances.

In this reaction, arrow sign is used in between reactants and products which indicates that the reactant will lead to the product.

Thus, the correct option is C.

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Predict the most likely effect of a two-nucleotide deletion in the middle of the intron located between exons 4 and 5 on the structure of protein A. Justify your answer.

Answers

Answer:

It is likely that this change has no effects on the protein function.

Explanation:

In eukaryotes, genes are composed of coding (exons) and non-coding  (introns) sequences. Since introns are not transcribed into messenger RNA, mutations affecting these sequences generally are neutral; however, it is important to note that introns may regulate gene expression  

Introns are the noncoding regions, which are present on the sections of the RNA transcript or DNA. The coding regions of the DNA molecules are known as exons. The introns are spliced out to continue translation.

The mutation, like insertion or deletion in the sequence of the introns, will not affect the molecule, such that it will be neutral.

Splicing is an essential process in which the sequence of introns is eliminated and only a sequence of exons are present. The splicing results in the formation of a mature RNA molecule, which is then translated into protein.

Introns are the intervening sequence, which can affect the gene expression by increasing the rate of transcription, nuclear export, and the stability of RNA transcript.

However, the introns can regulate gene expression.

Therefore, introns are the non-coding sequence, in which mutations are neutral but they can regulate the gene expression.

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During rolling-circle replication, RepA binds to the ori and nicks one strand of the DNA. The ______ end of the nicked DNA serves as a primer and is extended by DNA polymerase, while the ______ end is coated with single-stranded DNA-binding proteins and replicated using RNA and DNA polymerases.

Answers

Answer:

E

Explanation:

How does recombination contribute to evolution?

Answers

Answer: This crossing-over process results in an unlinking and recombination of parental genes. ... Subsequently, recombination by itself does not cause evolution to occur. Rather, it is a contributing mechanism that works with natural selection by creating combinations of genes that nature selects for or against.

Explanation:

Hope this helps!

Answer:

Recombination is an event, occurring by the crossing-over of chromosomes during meiosis, in which DNA is exchanged between a pair of chromosomes. ... Like mutation, recombination is an important source of new variation for natural selection to work upon.

Explanation:I just right on my test, unit test, assignment,and unit exam.

The cell-cycle control system initiates chromosome segregation only after _________ has occurred

Answers

Answer:

metaphase

Explanation:

The cell cycle control system initiates chromosome segregation only after metaphase has occurred.

At metaphase, the chromosomes of a dividing cell align at the equator to form what is known as the metaphase plate. Each chromosome gets engaged by spindles from the opposite sides of the poles at the kinetochore of the centromere.

Thereafter, the cell proceeds to the anaphase stage during which the shortening of the spindle fibers pulls the chromosome apart into sister chromatids and this eventually causes the sister chromatids to start migrating to opposite poles of the cell.

Which best describes an organism's niche?
life span
habitat
environment
role

Answers

Answer: Role

Explanation:

Answer:

The answer is D.) role

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Which of the following evidence best supports a claim that tryptophan functions as a corepressor? A. Normal expression of trpR causes the trp operon to be transcribed regardless of tryptophan levels. B. When the operator sequence is mutated, the trp operon is not transcribed. C. The trpR gene codes for a repressor protein that has a DNA binding domain. D. When trpR is mutated, the trp operon is transcribed regardless of tryptophan levels.

Answers

Final answer:

Tryptophan functions as a corepressor by binding to the trp repressor to inhibit the transcription of genes involved in tryptophan biosynthesis.

Explanation:

When tryptophan is not present in the cell, the repressor by itself does not bind to the operator; therefore, the operon is active and tryptophan is synthesized.

However, when tryptophan accumulates in the cell, two tryptophan molecules bind to the trp repressor molecule, changing its shape, allowing it to bind to the trp operator.

This binding of the active form of the trp repressor to the operator blocks RNA polymerase from transcribing the structural genes, stopping the expression of the operon.

36. Mammals are exposed to a variety of outside temperatures. However, they are able to
maintain a constant internal body temperature. Describe ways that mammals warm and
cool themselves in response to their environment. Include in your response:

Answers

Answer:

they cool them selfs by getting in water they heat themselfs by laying in the sun.

Explanation:

is this the answer your looking for?

The Earth has a total land area of approximately 150 million
square km. About how much is covered by rain forest?
A. 1.5 million square km
B. 10.5 million square km
C. 15 million square km
D. 50 million square km

Answers

Answer:

C. 15 million square km

Explanation:

The Earth has a total land area of approximately 150 million  square km. Scientists estimate that roughly 10% of the entire Earth is covered by Rainforests. That would make the total land mass covered by Rainforests to be about 15 million square km in distance. Although this number is decreasing drastically due to Ranching, mining, logging and agriculture.

Answer:

C. 15 million square kilometer

Explanation:

Rainforest refers areas of the Earth characterised by tall evergreen trees. The rainforest also has high amount of rainfall.

It helps to regulate our climate and provide us with everyday products.

They are structured in four layers which includes:

• Emergent layer

• Canopy layer

• Understory layer

• Forest floor layer

The approximate total land mass of the Earth is 150 million square kilometer.

The rain forest covers 15 million square kilometer of the total land mass of the Earth.

Changes to an ecosystem’s biodiversity can have a direct effect on humans because humans –
A : inhabit all areas of the Earth’s ecosystems.
B : use minerals from the ground to make things
C : rely mostly on solar power for energy.
D : depend on the Earth’s natural resources

Answers

Answer:

The answer should be D.

Final answer:

Changes to biodiversity can affect humans because they depend on Earth's natural resources.

Explanation:

The correct answer is D: depends on the Earth's natural resources.

Changes to an ecosystem's biodiversity can have a direct effect on humans because humans depend on the Earth's natural resources. Biodiversity refers to the variety and abundance of different species in an ecosystem. These species play important roles in providing resources such as food, water, and medicine, which are essential for human survival and well-being.

For example, if the biodiversity of a forest ecosystem decreases due to deforestation, humans may lose access to important resources such as timber for construction, medicinal plants, and clean water sources. This can have negative impacts on human health, livelihoods, and overall quality of life.

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. Just as energy flows through an ecosystem, matter also moves from organism to organism and from organisms to the environment. Using either a kelp forest or a hydrothermal vent ecosystem as an example, explain how carbon can move through the organisms in that ecosystem

Answers

The kelp ecosystem consists of the Kelp(Producers) →Sea urchins( primary consumers)→ Horn shark (secondary consumers)→ Northern elephant seals(tertiary consumers).

Explanation:

Kelp are the producers of this ecosystem in which uses sunlight to produce organic compound which is used by the primary consumers.

The primary consumers are herbivores. They feed on the algae and other plant material( organic material)

The secondary consumers feed on the herbivores. This is also a source of carbon to organism.

Then the tertiary consumer consumes the secondary consumers. So, the flow of energy starts from the producers and continues till the largest group of organism present in kelp ecosystem.

Then when the organism dies the carbon and the organic compound is made available in water by the help of the various bacteria and fungi.

This is how the continuous flow of carbon takes place in the kelp ecosystem.

Producers to herbivore to carnivores and so on.

In kelp forest, carbon can move through the organisms in that ecosystem when the herbivores feed on the vegetation because the producers fixes atmospheric carbon in its body in the form of carbohydrates. The herbivores release carbondioxide in the process of cellular respiration with the addition of water and energy in the form of ATP so in this way the carbon moves in the kelp forest.

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This is the application of a wide range of sciences to answer questions of interest to a legal system. DNA analysis is one component that may be used to place a suspect at a crime scene is called

Answers

Answer:

This is the application of a wide range of sciences to answer questions of interest to a legal system. DNA analysis is one component that may be used to place a suspect at a crime scene is called Forensic science

Explanation:

Forensic science the use of fingerprint, DNA to detect crime occurrence which gives accurate results as each individual is made of different DNA molecule

Light energy+CO2+H20=C6 H12 06+02 (the equation for photosynthesis)


Construct an explanation to describe the cycling of matter and energy that occurs during photosynthesis. Use the chemical equation to provide evidence.

Answers

Photosynthesis

Explanation:

Photosynthesis is the process by which photosynthetic organisms transform light energy into chemical energyPhotosynthesis is an oxidative reductive metabolic pathway in which water is oxidized and carbon dioxide is reduced to carbohydrates Light reaction of photosynthesis is concerned with light dependent oxidation of water and synthesis of high energy compounds such as ATP and NADPHAll proteins and cofactors which involves in light reaction are present in thylakoid membrane hence light reaction of photosynthesis completed in thylakoid membrane Transfer of electron and protons in thylakoid membrane is carried out by four protein complexes and two mobile electron carriers Oxidation of one water molecule generates two electrons, two protons and one atom of oxygen Transfer of one electron from Photosystem II (PSII) to Photosystem I (PSI) requires one photon and transfer of one electron from PSI to NADP+ requires one photon, thus transfer of two electrons from PSII to NADP+ requires four photonsFlow of two electrons from cytochrome b6f complex drives transportation of four protons from stroma to lumenThus oxidation of one water molecule establish gradient of 6 H+, gradient of 6 H+ drives synthesis of 2 ATPReduction of 1 NADP+ to  NADPH  requires two electrons, thus oxidation of one eater molecule generates 1 NADPH

7. Which has an exoskeleton?
A. a rhinoceros
B. a ladybug

Answers

The answer is B a ladybug
Ladybug is the answer :)

A cane toad produces a toxin (poison) in a gland behind its ear which can kill predators
that try to catch it and eat it for food. Some hedgehogs have a mutation which blocks
this toxin (poison) from entering their cells and keeps them from being harmed when
they catch and eat a cane toad,
Based on the information given above, Pick the statement below that best describes
the mutation of the hedgehog.
This mutation is neutral because it doesn't really help or hurt the hedgehog.
This mutation is harmful because the poison would still be in the body of the hedgehog if it ate the
cane toad.
This mutation is helpful because it makes the hedgehog immune to the cane toad toxin (poison) so
the hedgehog has more food sources for survival.
This mutation is helpful because it might make the hedgehog not be harmed by all toxins
(poisons).

Answers

Answer:

the first one

Explanation:

the mutation is nuertal because hedgechogs dont eat that much meat

Some shells grow
a. Rainbows
b. Four feet long
C. Butterfly wings

Answers

Definitely rainbows:)))

I don’t know anything about the 4 types of natural selection can somebody please help me?

Answers

Stabilizing – the intermediate phenotype is favored 8. A population of Madagascar hissing cockroaches lives in a woodpile. It suffers heavy predation from lizards. Because their heads are small, the lizards are unable to eat the very largest adult cockroaches, and instead prey upon small and medium sized adults.

You are a molecule of nitrogen. Choose a starting point in the nitrogen cycke and describe the process you would go through to move through the entire cycle

Answers

Answer:

Starting from the air

Explanation:

First Nitrogen in the air makes its way into the soil where nitrogen fixation occurs. This is done by specialised nitrogen fixing bacteria where it either becomes ammonia or ammonium. This is called ammonification. Nitrifying bacteria uses these components to create nitrates and the cycle moves into assimilation where this is taken up by plants and animals. Finally, denitrification occurs when the organic matter that took up the nitrogen decomposes to release the nitrogen back into the air.

Scientists discovered fossils in several layers of the Earth you see here. They found fossils of algae, snails, and clams in layer D. Given that information, where do you think they found fossil evidence of simple land plants and amphibians?

A) A
B) E
C) F
D) G

(This is on USA Test Prep)

Answers

Answer:

The answer is C.  F

Explanation: I did this on USATESTPREP

Answer:

C

Explanation:

I did it on USATestPrep

Cotton plants produce seeds that contain high-quality protein. This protein could be used as a food source except that the seeds are poisonous to humans. Recently, scientists have inserted a section of DNA into the cotton plants that makes the cotton seeds nonpoisonous. The technique for this procedure is known as _____.

A. gene manipulation B. cloning
C. reproduction
D. direct harvesting

Answers

The answer is A gene manipulation. You are manipulating a gene in the cotton plant to make it no poisonous

What enzyme is lacking in the Escherichia coli strain used by Okazaki in the experiments leading to his discovery of the DNA fragments that will form the lagging strand?
a) DNA polymerase
b) telomerase
c) DNA ligase
d) pyrophosphatase

Answers

D is the right for the question I guess and I got it right

The energy content and biomass of ________ is lowest in a terrestrial food web. The energy content and biomass of ________ is lowest in a terrestrial food web. small carnivores such as spiders and lizards primary consumers top carnivores detritivores and decomposers producers

Answers

Answer: top carnivores

Explanation:

Final answer:

The energy content and biomass of top carnivores is the lowest in a terrestrial food web, due to energy losses at each trophic level.

Explanation:

Within a terrestrial food web, two types of food webs are commonly identified: a grazing food web and a detrital food web. In a grazing food web, producers like plants serve as the base and are followed by various levels of consumers, including herbivores and carnivores. In contrast, a detrital food web is based on organisms that feed on decaying organic matter, including decomposers and detritivores.

Generally, the energy content and biomass of top carnivores would be the lowest in a terrestrial food web due to the energy lost at each trophic level. The energy content and biomass of primary consumers, such as herbivores, would not be the lowest as they directly consume the producers, which are abundant. Detritivores and decomposers, while they deal with dead organic matter and recycle nutrients, are also not positioned at the bottom of the energy pyramid. It's important to understand that detritivores and decomposers support the food web in a different way by breaking down waste and dead organisms, thus recycling nutrients back into the ecosystem.

What are two ways that diatoms differ from slime molds?

Answers

The external covering of diatoms are made up of, while slime molds have cell walls containing. diatoms are because they make food through photosynthesis, while slime molds are because they eat decaying plant matter

What is biodiversity?

A. a lack of different types of plant and animal species within a particular region
B. an abundance of different types of plant and animal species within a particular region
C. the different types of plants and animals that live in freshwater habitats
D. a method of conserving the planet’s small amount of potable water

Answers

Answer:

B. an abundance of different types of plant and animal species within a particular region

Biodiversity is the abundance of different types of plant and animal species within a region, which includes species, genetic, and ecosystem diversity. Answer B is correct, as it defines biodiversity as an abundance of different life forms in a region.

Biodiversity refers to the diversity (number and variety of species) of plant and animal life within a particular region. It encompasses the variety of living organisms, including their genetic differences and the ecosystems they form. To answer the question, biodiversity is:

B. an abundance of different types of plant and animal species within a particular region.

There are various types of biodiversity recognized by scientists:

Species diversity, which considers the number and kinds of species present in an area.Genetic diversity, which is represented by the variety of genes within a population and is essential for a species' adaptation.Ecosystem diversity, which includes the variety of ecosystems found in an area or on the planet.

Biodiversity is essential for maintaining healthy ecosystems and provides resilience against environmental changes. It contributes to the sustainability of our natural world and is key to the discovery of new resources like food crops and medicines.

How do aquatic factors affect the distribution of aquatic life (include both biotic and abiotic factors)? If possible, please answer in 6 or more sentences!!!

Answers

Answer:

Both the biotic and abiotic factors contribute to the distribution of the aquatic life in oceans, rivers etc.

Areas of the ocean which are unfavorable for organisms will have very little biodiversity. On the other hand, areas which have favorable living conditions will have most of the biodiversity of the aquatic life.

Some of the factors on which aquatic distribution depends are:

Temperature: Temperature is one of the crucial factors in determining the distribution of the aquatic life. Lesser fishes will be able to survive the harsh, freezing temperatures, hence the biodiversity will be low in such areas of the oceans. The aquatic distribution will be more in warmer areas of the ocean.

Light: Areas of the ocean or rivers which receive more light will have more plants in those areas. This is because photosynthesis requires light energy from the Sun. More plants means that more aquatic animals will also be present in those areas to feed on them.

Preys: Aquatic distribution will be more in areas where there are larger quantities of small fishes. This is because small fishes are the prey for many bigger fishes.

NEED RN 20 POINTS

The variables in the first part of this experiment include the presence of moisture and earthworm behavior. Use the
drop-down menus to identify the independent and dependent variables.
The presence of moisture is the
The earthworm behavior is the
variable.
W variable.

Answers

Answer:

The presence of moisture is the independent variable.

The earthworm behavior is the dependent variable.

Explanation:

Based on the nature of variables, the independent variable is the presence of moisture while the dependent variable is earthworm behavior.

What are variables in an experiment?

Variables in an experiment are factors on which the result of the expert depend on and can be altered by the researcher.

Variables can be either:

dependent variableindependent variable constant variable

The independent variable is altered by the researcher and produces changes in the dependent variable. The constant variable does not change.

In the given experiment, the independent variable is the presence of moisture while the dependent variable is earthworm behavior.

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Which occurs when the body responds to the environment by maintaining a stable internal environment despite changing
external conditions?
O spontaneous generation
O homeostasis
growth and development
O reproduction
Mark this and return
Save and Exit
Next
Submit

Answers

I’m pretty sure it’s homeostasis!

Osteoporosis is more prevalent among women than men because women generally

Answers

Answer: Osteoporosis is more prevalent among women than men because women generally have more bones in their bodies than men have. take in more calcium than men take in. have lower bone mass than men have. exercise more than men do.

Explanation: Becouse i think thats it

Answer:

Have lower bone mass than men have

Explanation:

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How can resource availability affect interactions between organisms?QUICK 15 pointsWhich of these can have a positive effecton your credit score?A paying credit card balance monthly6 late payments a new jobD high monthly debt repaymentC)OB BUREAUCRACIES1. Why are government agencies pulled in different directions?2. How does the president impose his priorities on these agencies?3. How does Congress impose its priorities? this book here is good fill in the blanks ____livre- ____ est bon Briefly describe ONE specific historical difference between the role of religion in Spanish colonization and in the colonization of New England. b. Briefly describe ONE specific historical similarity between the role of religion in Spanish colonization and in the colonization of New England. c. Briefly explain ONE specific historical effect of religion on the development of society in either the Spanish colonies or the New England colonies. Bella spent 15% of her paycheck at the mall, and 40% of that was spent at themovie theater. Bella spent a total of $13.74 at the movie theater for her movieticket, popcorn, and a soft drink. How much money was in Bellas paycheck? When trying to find the probability of rolling an even number on a number cube with numbers 1 through 6, how many desired outcomes are there? The manufacturing overhead budget at Polich Corporation is based on budgeted direct labor-hours. The direct labor budget indicates that 9,700 direct labor-hours will be required in February. The variable overhead rate is $8.30 per direct labor-hour. The company's budgeted fixed manufacturing overhead is $137,740 per month, which includes depreciation of $18,140. All other fixed manufacturing overhead costs represent current cash flows. The February cash disbursements for manufacturing overhead on the manufacturing overhead budget should be: The shorter leg of a right triangle is 8 less than the hypotenuse. The longer leg is 1 less than the hypotenuse. Find the perimeter of the triangle. Moreno Company Comparative Income Statement For the Years Ended December 31, 20-- 1 Current Year Previous Year2Sales $1,120,000.00 $1,000,000.003 Cost of goods sold 971,250.00 875,000.004 Gross profit $148,750.00 $125,000.005 Selling expenses $71,250.00 $62,500.006 Administrative expenses 56,000.00 50,000.007 Total operating expenses $127,250.00 $112,500.008 Income before income tax $21,500.00 $12,500.009 Income tax expense 8,000.00 5,000.0010 Net income $13,500.00 $7,500.00Required: A. Prepare a comparative income statement with horizontal analysis for the two-year period, indicating the increase (decrease) for the current year when compared with the previous year. Use the minus sign to indicate an amount or percent decrease. If required, round percentages to one decimal place. B. What conclusions can be drawn from the horizontal analysis? What type of successionwill occur if a parking lotis abandoned for 1000years? A 7-m long wire with a mass of 40 g is under tension. A transverse wave for which the frequency is 630 Hz, the wavelength is 0.5 m, and the amplitude is 7.1 mm is propagating on the wire. The maximum transverse acceleration of a point on a wire is closest to ____ m/s. 1024 players in a tennis tournament in each round half the players are eliminated which function can be used to find the number of players remaining in the tournament at the end of x rounds An electronic tuning aid is often used by a piano tuner to properly tune a piano. The frequency of the 64th key on a standard 88-key piano is 1046.5 hertz. Write a sine model that gives the Tone, T, as a function of time, t, for this key. 15 kilograms of rice are separated equally into 4 containers. How many kilograms of rice are in each container? Express your answer as a decimal and as a fraction. Hint: Use the remainder to form fractionsWe needa use fractions to solve this so help What is The factor to this problem?A.(x+2)(x-9)B.(x-3)(x-6)C.(x-2)(x+9)D.(x+18)(x-1) What were the 3 requests made by the boycott Shameeka sold her hamsters to a pet store. This doubled the number of hamsters in the store. Then the store got six more hamsters. If the pet store has 46 hamsters now, how many did shameeka sell to the store "I'm not even going to get into how, in choosing the single most efficient route to your desired destination, GPS excludes other routes and destinations you might not realize you desire to see, andremoves serendipity--which as any undergrad with a Penguin Classics edition of On the Road knows, is the very oxygen that makesa road trip come alive."In this statement, the author shows that he thinks -A.less well-known tourist attractions can be as thrilling as the popular ones.B.young people are more adventurous than older, more experienced travelersC.planning a trip in exact detail takes too much time and effortD.it's worthwhile to risk wasting time during a trip in the hopes of being surprised I need help please due today