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3. The gradual changes in a species through adaptation over time.
4. The place where an organism lives out its life.
5. Symbiotic relationship in which a member of one species benefit at the expenses of other species.
11. Large group of ecosystems that share the same type of climax community.
12. Symbiotic relationship in which one species benefits and the other species is neither harmed nor destroyed.
14. Group of organisms, all of the same species, which interbreed and live in the same area at the same time.
15. Organism that uses light energy or energy stored in chemical compounds to make energy-rich compounds.
17. Substance that forms hydrogen ions (H+).
18. All the strategies and adaptations a species uses in its environment.
19. Close and permanent association between organisms of different species.
21. A charge particle made of atoms.
22. Increases the speed of reactions.
23. Arid region with sparse to almost nonexistent plant life.

1. The ability of an organism to withstand fluctuations in biotic and abiotic environmental factors.
2. The smallest particle of an element that has the characteristics of that element.
4. Organism that cannot make its own food and feeds on other organisms.
6. Any inherited structure, behavior, or internal process that enables an organism changes.
7. large communities covered with rich soil, grasses, and similar plants.
8. Anything that possesses all of the characteristics of life.
9. Anything in an organism’s external or internal environment that causes the organism to react
10. Regulation of an organism’s internal environment to maintain conditions suitable for its survival.
11. The portion of earth that supports living things
13. Costal body water, partially surrounded by land, in which freshwater and salt water mix.
16. A reaction to a stimulus.
20. total weigh of living matter at each trophic level.