1. The study of the interactions among organisms and their environment

2. The non-living parts of the environment

3. The living, or once living, organisms in the environment

4. What are three examples of abiotic factors?

5. One individual from a population

6. All of the individual of one species that live in the same area at the same time

7. The populations of different species that interact in some way

8. All of the communities in an area and the abiotic factors they interact with

9. A large region with plants and animals well adapted to the soil and climate of a region

10. What is made up of all the ecosystems on earth?

11. The number of organisms in the population is called . . .

12. The population size that occupies a specific area is called . . .

13. How a population is arranged in a given area is called . . .

14. Any biotic or abiotic factor that limits the number of individuals in a population

15. The largest number of individuals of a species that an environment can support and maintain over a long period of time

16. The maximum rate at which a population increases if the environment has no limiting factors

17. A relationship in which both organisms cooperate and benefit

18. A relationship in which one organism benefits without harming the other

19. A relationship in which one organism benefits while the other is harmed

20. Any close interaction between two or more species

21. The act of one organism hunting, killing and feeding off another organism

22. The place where an organism lives

23. The role of an organism in the ecosystem

24. What is at the bottom level of a food chain?

25. The parts of the environment that are useful or necessary for the survival of living organisms

26. What abiotic factor would limit the growth of plants on the forest floor?

27. How much energy is typically available to the next level in a food chain?

28. Is there more energy at the top of the food chain or at the bottom of the food chain?

29. A series of overlapping food chains that exist in an ecosystem

30. Organisms that take in energy from the sun to make their own food are called . . .

31. Organisms that take in energy by breaking down the remains of dead organisms are called . . .