Look at the cladogram and answer the questions.

What two animals share the closest common ancestor?
Look at the picture. It shows the number of amino acid differences in cytochrome c between humans and other organisms.

Based on the chart, which organism is most closely related to humans?
How does embryology provide evidence for evolution?
Look at the pictures. How do the fossils provide evidence of horse evolution over time?

Which statement best explains why several brain areas are active when a person sees danger?
What does it mean to say that our brains have neuroplasticity?
How is a reflex arc different from a learned response?
Which of the following leads to natural selection?
What must be present for natural selection to occur?
Natural selection refers to...
Look at the image and answer the questions.
The beetle population has variation because...
Which group behavior most directly helps animals detect predators early?
Which are common benefits of group living? Select 3.
Which factor may decrease the benefits of group living?
Some birds give alarm calls that increase their own risk. Why might this behavior still persist?
A species lives where predators are common and food is abundant. Which behavior would most likely be favored?
Which explanation best connects group behavior to natural selection?
Which statement best explains why some species increase in number after an environmental change?
Which factors can cause changes in population size? (Select 2.)
After irrigation to water crops was introduced in a dry region, mosquito populations increased. What best explains this change?
Why is reproductive isolation important for the formation of new species?
Look at the picture. It shows how two different species of squirrels developed on the two sides of the Grand Canyon. How did the Grand Canyon contribute to speciation in squirrel populations?

Which of these is an example of how behavior can act as a reproductive barrier?
Which conclusion is best supported when reproductive barriers persist over many generations?
What trait do the wolf, leopard, and house cat have in common?
How does comparing cytochrome c amino acid sequences provide evidence for evolution?
Beetle color is a heritable trait because...
What will likely happen to this beetle population over time?