1. 1 Study of interactions of living organisms with one another and with their physical environment

2. 2 Ecology

3. 3 place where a particular population of a species lives

4. 4 Habitat

5. 5 all the members of one species in a particular area.

6. 6 population

7. 7 the community of organisms that live in an area along with their non-living surroundings.

8. 8 ecosystem

9. 9 the number of species in a specific area

10. 10 population density

11. 11 a factor in the environment that causes the population to decrease or go down. i.e. food and water, living space, weather

12. 12 limiting factor

13. 13 the many different species that live together in a habitat

14. 14 Community

15. 15 major biological community that occurs over a large area of land

16. 16 Biome

17. 17 the physical aspects of a habitat

18. 18 Abiotic

19. 19 the living organisms of a habitat

20. 20 Biotic

21. 21 number of species living within an ecosystem

22. 22 Biodiversity

23. 23 two or more species live together in a close, long-term relationship

24. 24 Symbiosis

25. 25 one organism feeds on and usually lives on or in another, does not usually kill the host (ticks)

26. 26 Parasitism

27. 27 a symbiotic relationship in which both species benefit (ants and aphids)

28. 28 Mutualism

29. 29 one species benefits and the other is neither harmed nor helped

30. 30 Commensalism

31. 31 the act of one organism feeding on another

32. 32 Predation

33. 33 the struggle for survival between living things for the limited resources.

34. 34 competition

35. 35 an animal that hunts and eats other animals; i.e. lions are the predators of zebras

36. 36 predator

37. 37 an animal that is hunted or eaten by other animals; i.e. mice are the prey of cats

38. 38 prey

39. 39 a change in the body or behavior of a species making it easier to survive. i.e. poisonous jellyfish, camouflage bugs, protective shell, etc.)

40. 40 adaptation