evolution

2. type of biology which studies why species are dying and see what they can do to help
4. a structure in an organism that is still there but no longer uses function
5. a structure that is structurally distinct but has a shared function
7. a change to the way a living thing acts or behaves
10. when organisms survive
13. when organisms adapt traits because of their environment
14. a change over time
16. when the last individual from a species dies
18. a structure that is similar across species because of a shared ancestor.
19. when a species acts like another
20. he created the hypothesis of evolution by natural selection
21. advantageous variations

1. a person who observes and examines plants and animals
3. a part of an organism's anatomy with a purpose that helps the organism survive
6. surviving traces or remains of an organism.
8. a change in the basic body processes that have an impact on a function behavioral
9. when a species adapt to its surroundings by blending in
11. a similarity in early development that shows similarity between many species
12. small difference in a population.
15. the development of new and unique species during the course of evolution.
17. when humans breed creatures or plants to develop certain aspects