| A | B |
|---|
| ecosystem | living and nonliving things in an area |
| population | all organisims of the same kind that live in a particular area |
| community | all the populations that live together in the same place |
| biotic factor | living parts of an ecosystem |
| abiotic factor | non-living parts of an ecosystem |
| symbiosis | a relationship between two kinds of organisms that lasts over time |
| competition | attempt by organisms to obtain a resource that is available in limited supply |
| niche | role in the community |
| food chain | a model of the path that the energy in food takes as it moves from one organism to the next in an ecosystem |
| producer | makes its own food |
| consumer | an organism that eats other organisms |
| decomposer | organism that breaks down the remains of dead organisms into simpler substances |
| food web | a model of how food chains overlap in an ecosystem |
| predator | organism that hunts and kills other living things for food |
| scavenger | animal that feeds on the remains of dead animals that it did not hunt or kill |
| energy pyramid | model that shows how energy flows through a food chain |
| climate | average weather pattern of a region over time |
| biome | a region that has a particular climae and contians certain types of plants and animals |
| esturay | water ecosystems that are located where rivers flow into oceans |
| limiting factor | a condition that controls the size or growth of a population |
| threatened | the species is in danger of becoming endangered |
| endangered | the species is in danger of becoming extinct |
| extinct | a species that no longer exists in the wild or captivity |
| biodiveristy | the wide variety of life on Earth |
| succession | the gradual replacement of one community by another |
| pioneer community | the first community of establish themselves in a lifeless area |
| climax community | a stable community where succession has slowed down or almost stopped |
| parasitism | one organism benefits and one organism is harmed |
| commensalism | one organism benefits and the other organism in not harmed |
| mutualism | the relationship benefits both organisms |
| herbiviores | primary consumers that eat only plants |
| carnivores | secondary and tertiary comsumers that eat other animals |
| omnivores | consumeres that eat both plants and animals |
| comparative stuctures | similar features in different organisms |
| homologous structures | body parts are similar but meet different needs |
