1. “LIFE CHANGES OVER TIME “ STUDY GUIDE

2. A _______ is a group of organisms that look alike and can reproduce among themselves.

3. ________ is the process by which species change over time.

4. An ________ is a feature or trait that helps an organism to live in a certain environment.
The giraffe’s neck has grown longer over time so it can eat leaves that grow at the tops of trees.

5. This albino snake’s mutation makes it more vulnerable to predators.
A sudden change in a gene is called a _____. It can be harmful or helpful .
This albino snake’s mutation makes it more vulnerable to predators.

6. Animals or plants that no longer exist are said to be_________.
Animals like this dinosaur no longer live on earth because they’re extinct.

7. _______ are the remains or traces of once-living organisms.

8. _______ is fossilized tree sap in which ancient insects are sometimes preserved.

9. __________ are body parts that have the same basic structure like the arm of a human, the leg of a cat, the flipper of a whale, or the wing of a bat.

10. ____________ are body parts that seem to have no function like a human being’s appendix.

11. Darwin’s theory of ____________ is that offspring with the most favorable traits survive and reproduce.

12. Differences in traits among organisms in a species is called _______.
There are variations in the color of these Sweet William flowers.

13. _________ is the study of human beings.