A population of green crickets lives in a lush, jungle habitat. A drought season causes the plants to dry up and turn brown. How might survival of the crickets be affected by this change?

A virus kills 99 percent of the members of a single species in an isolated region. The few remaining individuals reproduce and begin to repopulate the region. This is an example of

A new fossil is discovered and scientists conclude from comparative morphology that it is the forelimb of a vertebrate. What must the fossil look like?

When the allele frequencies of a population change because the size of the population has been reduced by disease or natural disaster, then ______________ has occurred.

How many conditions must be met in order for the Hardy-Weinberg equilibrium to exist?

Extreme phenotypes are favored in ____________ selection.

How might microevolution have occurred in a population of wading birds after only one very rainy season?

Ancient organisms that lived during closer time periods were more alike than organisms that lived in widely separated time periods. What evidence in the fossil record most directly supports this scientific claim?

Stabilizing selection helps counteract the effects of

Fossils show that ancestors of the giraffe had shorter necks than the modern giraffe. The evolution of the modern giraffe may be an example of

Certain antibiotics become useless over time because

According to an evolutionary tree, which organisms share the most recent common ancestry?

A population is

Which of the following statements about Charles Darwin is true?

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