Natural Selection Vocab Crossword

2. Preserved remains or traces of organisms that lived in the past.
4. Also called "survival of the fittest".
5. How organisms have evolved over time.
9. Study of the structure of animals and their body parts.
11. A branched diagram that shows the shared characteristics among a group of organisms.
12. Many different species.
13. Traits that help an organism survive and reproduce in a particular environment.
14. A group of organisms born around the same time.
16. When a species no longer exists.
17. Changes over many generations that leads to new species.

1. When different organisms evolved from a single species in the past.
2. The collection of all fossils discovered.
3. Differences in the genes and traits of individuals within a species.
6. Traits that are similar among different species.
7. A group of similar organisms that can breed and produce fertile offspring.
8. A group of individuals of the same species located in one area.
9. A trait that helps an organism survive and reproduce
10. Arranging things in order of time.
15. A family tree that shows the evolutionary relationships thought to exist among groups of organisms.