| A | B |
|---|
| organism | any living thing |
| habitat | an environment that provides an organism with what it needs to live |
| abiotic | nonliving |
| biotic | living |
| species | a group of organisms that can mate and produce fertile offspring |
| population | all the members of one species living in a certain area |
| community | all the populations living together |
| ecosystem | all the abiotic and biotic factors combined |
| immigration | the act of entering a population |
| emigration | the movement of individuals out of a population |
| birth rate | the number of organisms born in a certain amount of time |
| death rate | the number of organisms that die in a certain amount of time |
| limiting factor | an environmental influence that causes a population to decrease |
| carrying capacity | the largest population that an area can support |
| adaptation | a physical trait or behavior that helps an organism to survive in its habitat |
| competition | the struggle between organisms for limited resources |
| predation | when one organism kills another for food |
| predator | the organism that kills another for food |
| prey | the organism that is killed as food |
| symbiosis | a relationship between two species where at least one organism benefits |
| mutualism | a form of symbiosis where both organisms benefit |
| commensalism | a form of symbiosis where one organism benefits and the other is neutral |
| parasitism | a form of symbiosis where one organism benefits and the other is harmed |
| producer | an organism that makes its own food |
| consumer | an organism that eats other organisms for food |
| decomposer | an organism that breaks down wastes and dead organisms |
| scavenger | a carnivore that eats dead organisms |
| herbivore | a consumer that eats only plant material |
| carnivore | a consumer that eats only animal material |
| omnivore | a consumer that eats both plant and animal material |
| photosynthesis | when producers use the sun's energy to create their own food |
