The two different sources of variation is mutation and recombination. Mutations are changes in the DNA where a single change can have large effect in evolution when accumulated. It can stimulate rapid evolution of populations by providing new genetic variation on which natural selection, genetic drift, or gene flow can act.
Meanwhile, DNA recombination involves the exchange of genetic material either between multiple chromosomes or between different regions of the same chromosome through sexual reproduction where genetic shuffling occurs. This shuffling is important for evolution because it can introduce new combinations of genes in every generation.
The history of life on Earth is recorded in _____.
rock fossils
animal behavior
a gene pool
Lamarck's notes
rock fossils history of life
Answer:
Option A
Explanation:
The rock fossils depict the history of life because they consist of several deposits of old age fossil in different layers of rock strata. The layer of rock strata which lies at the bottom of any rock deposits is the oldest layer. By examining this oldest layer one can determine the prevailing atmospheric condition at the time of its formation. Also, examining the remains of fossil can help us to understand the forms of life existing during that time.
In this way all the layer of rock strata can be examined one by one from bottom (oldest) to top (youngest). This shall also allow us to understand the pattern of evolution of biological species with time.
Hence, option A is correct
How can so many different substances and molecules be created from just over 100 different elements?
If destroyed, would result in the greatest loss of species diversity? question 7 options:
a.tropical rain forest
b.tundra
c.grasslands
d.deciduous forests
e.islands
1. When does the autumnal equinox occur in the Southern Hemisphere? (1 point)June 21
March 21
September 21
December 21,
What event triggered the main eruption of mount st. helens may 1980? multiple choice melting snow caused a huge steam eruption. magma encountered groundwater and exploded. a landslide removed rocks and released pressure on the magma. all of these?
In which structure would a zygote occur in within the female reproductive system? A. Uterus B. Uterine wall C. Ovary D. Fallopian tube
The best way to reduce our unnecessary waste of energy is to improve _____.
What feature makes water a polar molecule? A. A water molecule is negatively charged. B.The middle of the water molecule contains opposing charges. C.The ends of the water molecule have opposite electrical charges. D.A water molecule is positively charged.
The ends of the water molecule have opposite electrical charges.
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The ends of the water molecule have opposite electrical charges...
2. True or false? The Atlantic Ocean is the biggest ocean on Earth.
False!
The Pacific Ocean is the biggest ocean on Earth. The Pacific Ocean is as big as all the other oceans put together.
Blood donations to the red cross are considered __________ products.
Blood donations to the Red Cross are considered public goods, which are products or services provided for the entire society's benefit. Such public goods are usually offered by governments or non-profit organizations.
Explanation:Blood donations to the Red Cross are considered public goods. The term refers to products or services that are provided for the benefit of all members of a society. Public goods are usually provided by the government or non-profit organizations such as the Red Cross. When an individual donates blood, that blood is available for anyone who needs it, regardless of whether they have also donated blood. Hence it's a public good - a valuable product that serves the common interest.
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If the sequence of nucleotide on mRNA template is AUCGUA then sequence of newly synthesized DNA strand would be?
Answer:
The correct answer will be- T A G C A T.
Explanation:
The mRNA is the messenger molecule formed by the process of transcription from the anti-sense DNA strand as a template.
The mRNA usually contains code for the synthesis of proteins but can also synthesize the DNA by the process of reverse transcription. The complementary nucleotide will bind according to the Chargaff rule which states that A will bind T or U and G will bind C.
So, if mRNA strand is- A U C G U A
DNA strand will be- T A G C A T.
The radiosonde can be used to measure upper air temperature. Please select the best answer from the choices provided T F
Answer:
It's true
Explanation:
Radiosondes are used to measure temperature, pressure and humidity at heights above 30 km. They can also be used to determine the wind at heights. There are other radiosondes used to measure the sun's radiation, ozone distribution, air conductivity, etc. They are mainly used for research. Its units are hectopascal, degrees Celsius, etc.
Injuries and deaths from motorcycle collisions are primarily from
the size of the bike makes it a lot harder to see and due to there being little to no protection
Motorcycle crash injuries and fatalities are mostly caused by the riders' lack of protection and susceptibility when compared to the occupants of enclosed vehicles.
Thus, riders on motorcycles have little physical protection, making them vulnerable to direct impact and even ejection following a crash. The possibility of suffering serious injuries rises in the absence of safety equipment like seat belts, airbags, and a protective vehicle frame.
The visibility of motorbikes on the road also makes accidents with other cars more likely. Motorcycles' rapid speeds can play a role in collisions brought on by driving too fast, being careless, or losing control. Motorcycle incidents are more likely to cause significant injuries and fatalities.
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list three things that an astronomer can learn about a star by studying its spectrum.
A star's spectrum lines help to detect the various important studies related to the spectral lines of the stars. The temperature, composition and density of the star will help the astronomer.
What are the gases found in stars ?The major gases that are found in stars are hydrogen and helium which undergoes various reactions in order to produce energy and these energetic reactions are helpful in stars twinkling.
The spectral lines is also helpful in diagnosing the magnetic field of the star where the temperature of the star in which it is present will also be shown by the spectral lines and the density of the star that is the volume present in the star is also shown by the spectral lines.
Therefore the major of 3 things that will be diagnosed with the help of the spectral lines are magnetic field, temperature and density of the star atmosphere.
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The process in which two or more species become more adapted over time
Where does a zygote implant after fertilization? Fallopian tube Vagina Uterus Ovary
Answer: Uterus.
Explanation:
The male and female gamete fuse together to produce gamete and the produced gamete is implanted in the uterus.
The growing fetus gets all the nutrition here for the growth of the fetus. The zygote gets attached to the uterine walls and stays there for development.
The growing fetus is delivered after nine moths and they stay in the womb for approximately 9 months.
Which of the following statements is true concerning the National Weather Service's ability to predict aerial flooding?
A. They can give good advance warning of how high flood waters will rise, but NOT when and where floods will occur.
B. They CANNOT give good advance warning of when and where floods will occur, or how high flood waters will rise.
C. They can give good advance warning of when and where floods will occur and how high flood waters will rise.
D. They can give good advance warning of when and where floods will occur, but NOT how high flood waters will rise.
What would you expect to see on the eeg record of a person who is engaged in an episode of sleepwalking?
Answer:
The correct answer is evidence of deep sleep (stage 4).
Explanation:
Sleepwalking or somnambulism is the condition found most commonly in the children between the ages 6 and 12. Though it is usually a harmless condition, however, spontaneous occurrences should be helped out with the help of a physician.
In the condition, the person goes from deep sleep to light drowsiness in a general sleep pattern. The individual generally encounters with few rounds of REM and non-REM sleep, or brisk movement of the eye.
The ________ division of the nervous system carries motor commands to muscles and glands.
The answer is efferent division. The nervous system acts as an input-output system. The afferent nervous system conveys signals to the brain following a stimulus. After processing of the information, the brain sends out a signal in response. This response is carried by the efferent nerve to the requisite organ involved in the response.
Final answer:
The motor division of the nervous system, part of the peripheral nervous system, sends motor commands to muscles and glands, divided into the somatic and autonomic nervous systems for controlling voluntary and involuntary actions.
Explanation:
The motor division of the nervous system carries motor commands to muscles and glands. This part of the nervous system is crucial for stimulating muscles to contract and glands to secrete hormones. It is part of the peripheral nervous system (PNS) and is further divided into two main systems: the somatic nervous system and the autonomic nervous system.
The somatic nervous system controls voluntary movements by acting on skeletal muscles, whereas the autonomic nervous system regulates involuntary activities, influencing glands, smooth muscles, and cardiac muscles. It includes further subdivisions like the sympathetic and parasympathetic systems, which are responsible for the body's fight-or-flight response and rest-and-digest activities, respectively.
Process by which radiation from a planets atmosphere warms the planets surface to a temperature above what is would be without its atmosphere
Process by which radiation from a planets atmosphere warms the planets surface to a temperature is greenhouse effect.
What is greenhouse effect?The greenhouse effect is a process that occurs when energy from a planet's host star goes through the planet's atmosphere and heats the planet's surface.
The greenhouse effect is a process that occurs when gases in Earth's atmosphere trap the Sun's heat. This process makes Earth much warmer than it would be without an atmosphere.
The greenhouse effect is the way in which heat is trapped close to Earth's surface by “greenhouse gases.” These heat-trapping gases can be thought of as a blanket wrapped around Earth, keeping the planet toastier than it would be without them.
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The greenhouse effect is the process where a planet's atmosphere warps surface temperature by trapping infrared radiation through greenhouse gases, leading to a warmer planet than it would be without such an atmosphere.
The process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere is known as the greenhouse effect. This warming occurs because certain gases in the atmosphere, called greenhouse gases, are capable of trapping infrared radiation and reradiating some of it back to the planet's surface, thus raising the temperature. Earth's natural greenhouse effect, which is primarily due to water vapor and carbon dioxide, increases the average surface temperature significantly. Planets like Mars, with a very thin atmosphere, experience less greenhouse warming, while Venus, with its dense carbon dioxide atmosphere, experiences extreme greenhouse warming. Understanding the balance between incoming solar energy and the heat-trapping properties of greenhouse gases is crucial for determining the surface temperature of a planet. The Earth retains enough of this reradiated heat to prevent the oceans from freezing over, while Mars, which may have had a thicker atmosphere in the past, remains colder in its current state. The enhanced greenhouse effect due to human activities, such as the burning of fossil fuels, has become a significant concern because it is linked to global warming and climate change.
Which factor would be least likely to contribute to the development of a new species?
The factor that will be least likely to contribute to the development of a new species is plentiful resources within the environment occupied by the species. The correct option is 1.
What is speciation?A new plant or animal species is developed through speciation. When a group within a species separates from other members of its species and develops its own distinct features, speciation has taken place.
Rivers change their courses, mountains rise, continents drift, organisms migrate, and what was once a continuous population is split into two or more smaller populations, according to scientists, who believe that geographic isolation is a common method for the process of speciation to start.
The abundance of resources in the ecosystem the species inhabits will be the factor least likely to aid in the formation of a new species.
Thus, the correct option is 1.
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Your question seems incomplete, the probable complete question is:
Which factor would be least likely to contribute to the development of a new species?
(1) plentiful resources within the environment occupied by the species
(2) increased genetic variation within the species
(3) changes in the environment of the species
(4) the ability of the species to increase its numbers by reproduction
Nerve impulses leading to the brain carry information about cool temperatures on the skin. the nerve fibers sending these signals will most likely belong to which division of the nervous system? sensory (afferent) division somatic nervous system sympathetic division parasympathetic division
The answer sensory (afferent) division. The nerves are sensory because they perceive sensory stimuli, in this case, temperatures. Additionally, afferent nerves carry impulses to the Central Nervous System while efferent nerves carry impulse to muscles and glands in response to information brought in by afferent nerves.
How is the median defined if the number of observations is even?
a. the average of the two middle observations
b. the difference between the two middle observations
c. the most frequent observation
d. the difference between the highest and smallest observation?
Alcohol is eliminated from the body chemically unchanged in
Alcohol is eliminated from the body through a process called alcohol metabolism, during which the liver breaks it down into carbon dioxide and water. This helps remove alcohol from the bloodstream. The rate at which alcohol is eliminated can vary from person to person.
Explanation:Alcohol is eliminated from the body chemically unchanged through a process called alcohol metabolism. When alcohol is consumed, the liver breaks it down through a series of steps, involving various liver enzymes, to convert it into carbon dioxide and water. This process helps remove alcohol from the bloodstream. The liver metabolizes the majority of the ethanol circulating in the blood, and the rate at which alcohol is removed can vary from person to person.
Alcohol metabolism involves two main processes: oxidation and elimination. In the liver, alcohol dehydrogenase converts ethanol to acetaldehyde, which is further metabolized to acetate by aldehyde dehydrogenase. Acetate is then converted into carbon dioxide and water. This process, occurring primarily in the liver, helps eliminate alcohol from the body.
Latoria is horseback riding when she falls and hits her head. after the accident, she has difficulty performing finely coordinated movements. latoria has most likely damaged her ____.
a. medulla oblongata
b. reticular formation
c. cerebellum
d. locus coeruleus
Final answer:
Latoria has most likely damaged her cerebellum, which is responsible for balance, coordination, movement, and motor skills. The correct answer is option C, "cerebellum."
Explanation:
Latoria is horseback riding when she falls and hits her head, and afterward has difficulty performing finely coordinated movements. Given these symptoms, Latoria has most likely damaged her cerebellum. The cerebellum is the part of the brain responsible for controlling balance, coordination, movement, and motor skills. It receives messages from muscles, tendons, joints, and structures in our ear to manage these functions. The cerebellum can make necessary changes to motor commands, as seen when a person adapts their walking movement in water. When the cerebellum does not work properly due to damage or the effects of alcohol, coordination and balance are significantly impaired.
During the removal of wastes in a cell, the waste products move
A. from the nucleus of the cell to one side of the cytoplasm for storage.
B. from an area of lower concentration to an area of higher concentration.
C. from the cytoplasm of the cell to one side of the nucleus for storage.
D. from an area of higher concentration to an area of lower concentration.,
What are microscopic blood vessels that connect arteries and veins?
During the cell cycle, specifically G1 interphase, a cell must reach a sufficient size and produce enough ATP in order to A) undergo mitosis. B) undergo cytokinesis. C) produce 2 daughter cells. Eliminate D) replicate its chromosomes.
Answer: Replicate its chromosomes
Explanation:
The cell in the body goes through the cell cycle regulation. There are various stages of cell cycle regulation.
Out of those stages one is G1 phase at the end of which the cell is prepared for the synthesis phase.
The cell gets supplied with proteins, increases in the number of organelles and grows in size.
This occurs so that in the next stage the cells can replicate its chromosomes and new cells are formed.
The palatine tonsils are located between which two structures
At the back of the throat is where the palatine tonsils are located. One of the tonsils is on the right side of the throat while the other tonsil is on the left side of the throat. The major roles of the these tonsils is to protect the body against gastrointestinal and respiratory infections.
A normal human cell containing 22 autosomes and a y chromosome is a(n):