Final answer:
Dinosaurs first appeared about 225 million years ago and thrived until about 65 million years ago, when they went extinct due to a mass extinction event. They spanned the Mesozoic Era, known as the Age of Dinosaurs, and today, birds are their closest living descendants.
Explanation:
Duration of Dinosaurs on Earth
Dinosaurs first appeared approximately 225 million years ago, during a period known as the Triassic. These magnificent creatures roamed the Earth during the Mesozoic Era, often referred to as the Age of Dinosaurs, which is divided into three periods: Triassic, Jurassic, and Cretaceous. Their reign lasted until about 65 million years ago, marking the end of the Cretaceous period, when they went extinct due to a mass extinction event. This catastrophic occurrence, likely caused by a combination of asteroid impact and volcanic activity, heralded the rise of mammals and eventually led to the existence of humans.
The first dinosaurs began to evolve during the Mesozoic Era, which lasted from about 245 million years ago until their extinction at the end of the Cretaceous period. Throughout the Mesozoic Era, dinosaurs evolved and diversified into a wide array of species, culminating in some of the most impressive creatures to ever walk the Earth, such as the Tyrannosaurus Rex.
After the asteroid impact that created the Chicxulub crater and triggered volcanic eruptions, the once-dominant dinosaurs went extinct, and their disappearance opened up ecological niches for mammals to expand and diversify into the myriad forms we see today. The only remaining descendants of the dinosaurs are the birds, which have thrived and diversified into thousands of species around the globe.
You have a strand of DNA with the nucleotide sequence AGATCGATT. The complementary strand will have which of the following sequences?
A) CTGGATCGG
B) TCTAGCTAA
C) AGTTCGATT
D) GACCTAGCC
Answer:
The answer is B
Explanation:
with complementary strands A goes with T
and G goes with C
so AGA TCG ATT
becomes TCT AGC TAA
you can see how you swap A's with T's and C's with G's. and vice versa.
9. Analyzing Ideas Why does fusion occur in the
sun's core but not in other layers?
Which of these actions is not a way to conserve
energy resources?
a. turn off lights when they are not needed
b. increase usage of mass transit
c. reduce the cost of energy production
d. increase efficiency of appliances
Which statement is true regarding keystone species in an environment?
Answer: The question is not complete, the options are not given.
But the correct answer is.
They are likely symbiotic with the dorminant species.
Explanation:
A keystone species is a species which has disproportionately large effect on the communities it hold together by maintaining the biodiversity of the ecosystem and causing the abundance of other organisms present in the ecosystem. They play a role in the existence of species present in their environment.
The tree types of keystone species are predators, mutualist and ecosystem engineers.
In the cell which organelle has the function of using oxygen in the breakdown
Answer: Mitochondria
Explanation:
Answer:
In the cell which organelle has the function of using oxygen in the breakdown
Lysosomes
Explanation:
Lysosomes helps in breaking down of food particles in the cell as well as digestion of cell itself when it dies
the carbon cycle begins when
Answer:
when carbon goes from the atmosphere into organisms and the Earth and then back into the atmosphere. Plants take carbon dioxide from the air and use it to make food.
Explanation:
Mark received one dominant allele for brown hair from his father and another dominant allele from his mother.
Which word describes his genotype?
A blonde
B heterozygous
Chomozygous
D brown
Answer:
homozygous
Explanation:
when an individual both copies of a given gene have the same allele
In genetics, an individual who receives one dominant allele and one recessive allele is said to be heterozygous for that gene.
Explanation:In genetics, an individual who receives one dominant allele and one recessive allele is said to be heterozygous for that gene. The dominant allele is represented by an uppercase letter, and the recessive allele is represented by a lowercase letter. In this case, since Mark received one dominant allele for brown hair from his father and another dominant allele from his mother, his genotype can be described as heterozygous.
2 Points
Which habitat receives the least amount of rain?
O
A. Tropical rain forest
O
B. Grassland
O
C. Desert
O
D. Deciduous forest
Answer:
Desert
Explanation:
if you even just look it up out of all habitats, desert is the option.
Deserts are found commonly near the equator, they are excruciatingly hot in the day, and freezing cold at night. They get little rain due to the heat or cold.
Definitely not rain forest, rain IN THE NAME
Grasslands in the US get rain fairly frequently. The graslands on the savanna have rain seasons too.
Deciduous forest is kind of the average pine and oak forest so rain does occur
i hope this helps u
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what are the short term affects of decline in bee population?
Which organism has the most available energy in this food chain?
Dragonfly
Hawk
Snake
Grass
The answer is grass. It is making its own food and is a producer.
Answer:
grass
Explanation:
grass has the most energy because they make there own food.
How did Pasteur help to disprove spontaneous generation?
Answer:
To disprove the theory of spontaneous generation, Louis Pasteur devised a way to flask that allowed oxygen in, but prevented dust from entering. The broth did not show signs of life until he broke off the neck of the flask allowing dust, and therefore microbes, to enter.
Explanation:
What is a potential effect of rapid climate change on Earth?
Answer:
Melting polar ice caps leading to rising ocean waters
Explanation:
When a cell differentiates, it becomes a stem cell.
○True
O False
Answer:
Technically yes, and no. Read the following:
Explanation:
Stem cells can give rise to specialized cells. When unspecialized stem cells give rise to specialized cells, the process is called differentiation. While differentiating, the cell usually goes through several stages, becoming more specialized at each step.
The statement is incorrect. Cell differentiation is the process by which a stem cell, which is less specialized, becomes more specialized. This ability of stem cells sets them apart as they can regenerate and replace damaged cells.
Explanation:The statement 'When a cell differentiates, it becomes a stem cell' is False. This is because cell differentiation is the process by which a less specialized cell, such as a stem cell, becomes a more specialized cell type. For instance, stem cells can differentiate to become heart muscle cells, brain cells, or skin cells, among others. The ability of stem cells to differentiate into specialized cells is what makes them so important in biology and medicine - they're essentially a cell type that can regenerate and replace damaged cells in the body.
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aa. Aa. AA. Zebra mussels have the following genotypes and phenotypes. Which cross would produce the greatest number of heterozygous. A) AA x aa. B) Aa x Aa. C) AA x AA. D) as x Aa
Answer: A (AA x aa)
Explanation:
In option (A) both of the parent mussels are homozygotes, for alleles "a" and "A" respectively. Therefore, every single one (100%) of their offspring would be expected to be Aa heterozygotes. Combinations (B) and (D) yield a lower proportion of heterozygotes (50%), and combination (C) yields none at all. Punnett squares follow:
(A)
| A A
a | aA aA
a | aA aA
(B)
| A a
A | AA Aa
a | aA aa
(C)
| A A
A | AA AA
A | AA AA
(D)
| A a
a | aA aa
a | aA aa
Answer:
In option (A) both of the parent mussels are hom0ygotes, for alleles "a" and "A" respectively. Therefore, every single one (100%) of their offspring would be expected to be Aa heterozygotes. Combinations (B) and (D) yield a lower proportion of heterozygotes (50%), and combination (C) yields none at all. Punnett squares follow:
(A)
| A A
a | aA aA
a | aA aA
(B)
| A a
A | AA Aa
a | aA aa
(C)
| A A
A | AA
| A a
a | aA aa
a | aA aa
Explanation:
1. How does the environment affect the process of natural selection?
Answer:Harmful or beneficial mutations do influence an organism's survival. This is where natural selection comes into play. ... This is how organisms evolve and adapt to changing environmental conditions over time.
Explanation:
Answer: The environment affects natural selection. Speices need to adapt to changes in environmet. The weaker organisms which fail to adapt to environment perish while the stronger ones who adapt to the environment survive. This is how environment affects natural selection.
Which of the following is a function of the kidneys?
O
A. To remove carbon dioxide from the blood and send it to the
urinary bladder
O
B. To catch toxins in the blood and send them to the liver
O
C. To catch nutrients that slipped away from the digestive system
O
D. To remove salts from the blood so osmosis works properly
option (a)
Explanation:
Kidneys remove waste products from the blood and produce urine
Which area or part of the brain is likely affected in a person with cerebral palsy who has movement problems in their right arm and hand? Explain your answer.
Answer:
part of the brain that controls muscles
Explanation:
It affects movement, balance, and muscle tone leading to rigidity in the joints, involuntary movements, and exaggerated reflexes.
The left hemisphere of the cerebral cortex is likely affected in an individual with cerebral palsy who experiences movement problems in their right arm and hand due to the contralateral nature of motor control. Damage to areas such as the precentral gyrus can lead to such motor impairments.
Individuals with cerebral palsy (CP) usually have movement difficulties due to brain injury sustained before, during, or shortly after birth. The brain regions responsible for the control of body movements are affected, and the symptoms can range from mild muscle weakness to severe motor disabilities. Specifically, if a person with cerebral palsy has movement problems in their right arm and hand, the area likely affected is located in the left hemisphere of the cerebral cortex.
This inference is because the motor control of each side of the body is governed by the opposite side of the brain due to the cross-wiring of the corticospinal tract. Commands for motor movement are issued by the precentral gyrus, commonly known as the primary motor cortex, which is in the left hemisphere for the control of the right side of the body in about 95% of the population. Considering the non-progressive and permanent nature of the postural and movement disorders in cerebral palsy, interventions often focus on rehabilitation to improve or maintain motor function and coordination.
How many population can make up a community
Answer: Individuals make up a population; populations make up a species; multiple species and their interactions make up a community; and multiple species and their interactions make up ecosystems when you include the abiotic factors. This is the hierarchy of ecology.
hope this help
Explanation:
If one copy of a dominant allele is present in genotype, then the trait is?
Answer:
the trait is whatever the dominant allele is
Explanation:
Which of the following statements makes an accurate correlation between stages of hominid evolution?
a) The brain decreased in size allowing for hominids to use tools.
b) The brain increased in size which resulted in hominids developing tools.
c) As the brain decreased in size the skull increased in size.
d)Language developed as a result of increasing the size of the skull.
The statement that accurately correlates stages of hominid evolution is that the brain increased in size, leading to the development of tools.
Explanation:The correct statement that makes an accurate correlation between stages of hominid evolution is b) The brain increased in size which resulted in hominids developing tools.
This statement reflects the correlation between the increase in brain size and the development of tools in hominids. As the brain size increased over time, it allowed hominids to develop the cognitive abilities necessary to create and use tools. This development in tool-making skills played a crucial role in the success and adaptability of hominids in their environment.
In contrast, the other options are inaccurate. The brain did not decrease in size during hominid evolution, and there is no direct correlation between the decrease in brain size and the increase in skull size. Additionally, while language development is believed to be linked to brain size and cognitive abilities, it is not directly related to the size of the skull.
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WILL DO BRAINLY. The diagram shows fossils embedded in rock layers.
Based on the diagram and the table, when was fossil 1 formed?
A) after any of the other labeled fossils
B) before any of the other labeled fossils
C) after fossil 2, but before fossils 3, 4, and 5
D) before fossil 2, but after fossils 3, 4, and 5
Answer:
D)
Explanation:
Since the fossil is on the second layer anything above that is formed directly after since it is on the top. Meanwhile everything below that was formed before.
How do pain relievers work?
A.) Increase production of white blood cells
B.) Increase body temperature
C.) Block messages within the nervous system
D.) Block hormone production
Answer:
C
Explanation:
The pain relievers work by blocking messages within the nervous system. Therefore, the correct option is C.
What are pain relievers?Pain relievers are the medications that are used to reduce or relieve pain and other variety of problems such as headache, chronic or acute pain after trauma, etc.
Most pain relievers work by blocking the production or release of certain chemicals in the body that send pain signals to the brain. These chemicals, called prostaglandins, are produced by the body in response to injury or inflammation.
Pain relievers like aspirin, ibuprofen, and naproxen work by blocking the enzyme that produces prostaglandins, thereby reducing pain and inflammation. Therefore, the correct option is C.
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While performing online research on bacteria, Emilie found that some bacteria survive even in hydrothermal vents that can be traced back to early common ancestors. Which bacteria are these?
A.
hydrophilic bacteria
B.
hydrophobic bacteria
C.
thermophilic bacteria
D.
thermophobic bacteria
E.
lipolytic bacteria
Answer:
C. thermophilic bacteria
Explanation:
These types of bacteria can live in high temperature or they require high temperature to live. Archae bacteria belongs to thermophiles. These bacteria grow well in temperature between 55 to 113 degrees Celsius. These bacteria found in hot springs and hydrothermal vents. Examples of thermophilic bacteria are Cyanidium caldarium and Chaetomium thermophile.
Answer:
c
Explanation:
Which organism will have DNA most similar to the bird? Why?
Answer:
reptiles have similar to the bird.
Final answer:
Members of the same species have the highest DNA similarity and organisms with a more recent common ancestor share more DNA sequences in common. Comparison of DNA among different organism pairs shows varying degrees of molecular differences based on the time since their evolutionary split. A bird is genetically closer to another bird species due to shared evolutionary history.
Explanation:
The organism that would have DNA most similar to a bird is likely another bird species due to the homologous structures and genetic similarities they share, illustrating a close evolutionary relationship. Broadly speaking, members of the same species have the highest level of DNA alignment. In contrast, organisms that diverged earlier in evolutionary history, such as a bird and a mammal, would have more significant molecular differences in their DNA. Hence, when comparing DNA similarities among various organisms, the evolutionary timeline is a critical factor. Comparisons between a mammal and a bird, a mammal, and a frog, or a mammal and a fish would reveal increasingly significant differences the further back the common ancestor existed.
For instance, a whale would share more DNA sequences with a horse than with a shark, even though sharks may appear more similar to whales due to their aquatic environments. This is because whales and horses are both mammals, whereas sharks are fish, and the evolutionary split between mammals and fish occurred much earlier.
Which of the following best matches a part of a living cell with the function it performs?
O Cytoplasm: green structure inside plant cells
O Cell membrane: green structure inside plant cells
Cytoplasm: surrounds a cell and allows substances to pass in and out
O Cell membrane: surrounds a cell and allows substances to pass in and out
Answer:
O Cell membrane: surrounds a cell and allows substances to pass in and out
Explanation:
Cell membrane is also called plasma membrane. Cell membrane is the boundary of the cell which helps in the protection of the cell from external environment. Cell membrane is a semipermeable membrane which has small pores that allows substances such as water, glucose, Sodium ion, oxygen and carbondioxide etc to pass through it.
Answer:
(C.)
Cytoplasm: surrounds a cell and allows substances to pass in and out
Other creatures that commonly reproduce through regeneration include all EXCEPT
A. sea cucumbers
B. sponges
C. hydra
D. sea urchins
71 points!!
The moon does not have its own ___________.
Which term best completes the sentence?
A.gravity
B.light
C.revolution period
D.rotational period
Darwin’s theory of evolutions unifies all of __________.
Answer:
biology
Explanation:
Which of the following combinations would create the fastest chemical reactions?
A.
a whole antacid tablet and vinegar at 25 degrees Celsius
B.
a whole antacid tablet and vinegar at 50 degrees Celsius
C.
a crushed antacid tablet and vinegar at 25 degrees Celsius
D.
a crushed antacid tablet and vinegar at 50 degrees Celsius
The combinations which would create the fastest chemical reactions is a crushed antacid tablet and vinegar at 50 degrees Celsius. Thus, the correct option is D.
What factors affect rate of a chemical reaction?The five factors which can affect the rates of the chemical reactions include the chemical nature of the reacting substances or reactants, the state of subdivision which is one large lump versus many small particles of the reactant molecules, the temperature of the reactant molecules, the concentration of the reactant molecules, and the presence of a catalyst in the chemical reaction.
The combinations which would create the fastest chemical reactions include taking a crushed tablet as a better option than whole tablet because as the surface area of the tablet increases, the rate of reaction increases. Also, as the temperature of the reaction increases, the rate of reaction also increases. So, 50 degrees Celsius temperature is better option than 25 degrees Celsius.
Therefore, the correct option is D.
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I WILL GIVE BRANLIEST FOR ANSWER
Kristen goes to the beach with her family on a summer afternoon. Her parents set up a
beach umbrella as a protection from the bright sunlight, and they place a small folding
table under it. Kristen takes a can of lemonade from an ice chest and drinks half of it. Then
she places the can on the table and walks down to the water. The dry sand feels very hot to
her feet, but the wet sand at the water’s edge, being constantly lapped by tiny waves, feels
cool. After about an hour of walking along the beach, Kristen returns to the umbrella. She
picks up her can of lemonade, and it is now warm.
1. Why does the dry sand feel hot to Kristen’s feet?
2. Why does the wet sand feel cool to Kristen’s feet?
3. Why has Kristen’s can of lemonade become warm?
4. What example of thermal equilibrium can you identify in this scenario?
The dry sand feels hot due to its low thermal conductivity and low specific heat, causing it to rapidly warm on the surface. The wet sand feels cooler due to the higher specific heat and thermal conductivity of water, in addition to evaporative cooling. The lemonade warms up due to thermal equilibrium, reaching the temperature of the surrounding air.
Understanding Thermal Phenomena at the Beach:
Dry sand feels hot to Kristen's feet because sand has a low thermal conductivity, which means it does not distribute heat well. The heat from the sun stays at the surface, causing the top layer to become much hotter than the lower layers. This is also impacted by the sand's low specific heat, causing it to heat up quickly when exposed to sunlight.
Wet sand feels cool because water has a higher specific heat and a better thermal conductivity than sand. As a result, the heat is absorbed more uniformly throughout the wet sand and water, and the energy from the sun is partly used to evaporate water, which has a cooling effect due to the energy required for the state change from liquid to gas.
Kristen's can of lemonade becomes warm due to thermal equilibrium. The can's temperature adjusts to match the surrounding air temperature under the umbrella, which is warmer than when she initially took the drink out of the ice chest.
An example of thermal equilibrium in this scenario is the warm can of lemonade which has reached the same temperature as the surrounding air under the umbrella after being left out for an hour.