Chapter 3 Lesson 1.2 The Environment and Change Over Time

Multiple Choice

According to the fossil record, how many mass extinction events have occurred during the Phanerozoic eon?

• Three

• Five

• Seven

• Ten

Multiple Choice

Which of the following best defines biological evolution?

• The process by which fossils are formed

• The change over time in populations of related organisms

• The extinction of species over time

• The study of ancient bones

Multiple Select

Which of the following statements are true about how scientists use fossils?

• Scientists use fossils to determine the age of rocks.

• Scientists use fossils as evidence that species have changed over time.

• Scientists use fossils only to study extinct animals.

• Scientists use fossils to understand the environments of the past.

Multiple Choice

What is a mass extinction?

• When a single species dies out

• When many species become extinct within a few million years or less

• When a new species evolves

• When an environment remains unchanged