BIG HISTORY

5. Selection: The process whereby organisms better adapted to their environment tend to survive and produce more offspring.
6. The study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behavior, origin, and distribution.
8. An expert in geology
11. Having or representing the earth as the center
14. A scientist who studies fossils
15. The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
16. An expert in or student of natural history.
17. The state or process of a species, family, or larger group being or becoming extinct.
18. A nucleic acid present in all living cells

1. A group of organisms having many characteristics in common and ranking below a genus.
2. An acid in the chromosomes in the center of the cells of living things.
3. A permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people.
4. The activity or condition of competing.
7. A biological community of interacting organisms and their physical environment.
9. Having or representing the sun as the center, as in the accepted astronomical model of the solar system.
10. A change or difference in condition, amount, or level, typically with certain limits.
12. The action or process of adapting or being adapted
13. The action or process of bringing something into existence.