This evidence comes from Earth's crust. It is the timeline of past life, organized by estimated ages and classified by similarities in form. What is it?

Over a period of years, the average rainfall in an area decreases, causing environmental changes. Most likely to survive these environmental changes is a population

A(n) ______________ is any variation that makes an organism better suited to its environment.

According to Darwin's theory of evolution, how do new species evolve?

Natural selection is sometimes called

Which scenario is an example of natural selection?

Most evidence of evolution comes from

Which situation could lead to the extinction of a species?

In the theory of natural selection, species are most likely to survive if they

Individuals within a population have slightly different traits, or variations. How do variations improve the likelihood that a population will survive?

What is most likely to happen to a species that is not suited to its environment?

Which factor is not likely to cause a species to become extinct?

If species A reproduces at a faster rate than species B, which species is expected to evolve at a faster rate?

Why did white peppered moths change to black peppered moths in the cities?

A species that cannot successfully adapt to its environment can become extinct.

A frog may have hundreds of offspring at a time, but only a small number will survive. This is an example of

The more closely related two different organisms are, the

An organism’s relative fitness is measured by its

A species is defined as

Which of the following can scientists NOT interpret by examining fossils?

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