Chapter 3 Lesson 1.2 The Environment and Change Over Time

Three

Five

Seven

Ten

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

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.

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