1. Organism a type of living thing
2. Habitat is an environment that provides the things the organism needs to live, grow, and
reproduce.
3. Biotic-the living part of the habitat.
4. Abiotic is the nonliving part of the habitat.
5. Species a group of organisms that are physically similar and can reproduce.
6. Population -all the members of one species in a particular area.
7. Community-all the different populations that live in a particular area.
8. Ecosystem all the organisms that live in a particular area, along with their nonliving
surroundings.
9. Ecology-the study of how living things interact with one another and their environmental
surroundings.
10. Immigration- to move into a population.
11. Emigration to move out of a population.
12. Limiting factors- are environmental factors that cause decreases in populations.
13. Carrying capacity is the largest population that can be sustained in an area.
14. Natural Selection- a characteristic that makes a particular organism better suited to live in an
area and reproduce.
15. Niche-the role of an organism in its habitat or how it lives in its environment.
16. Competition- the struggle between organisms to survive due to resources.
17. Predation-the interaction between organisms where one kills another for food.
18. Predator an organism that kills others.
19. Prey an organism that is killed for food.
20. Predator adaptations are organisms that have characteristics that make them more efficient
killers.
21. Prey Adaptations are organisms that have characteristics that make them better at avoiding
being killed.
22. Symbiosis-a close relationship between two species that benefits at least one species.
23. Mutualism- a relationship between two species where both species benefit.
24. Commensalism -a relationship between two species where one species benefits while the other
is neither helped nor harmed.
25. Parasitism- a relationship between two species where one species benefits while the other is
harmed.
26. Parasite is an organism that benefits from symbiosis in # 25.
27. Host is an organism that is harmed from symbiosis in # 25.