| A | B |
|---|
| habitat | The place where an organism lives and that provides the things the organism needs |
| biotic factors | living parts of an ecosystem |
| abiotic factors | the nonliving parts of an ecosystem |
| population | all the members of one species in a particular area |
| community | all the different populations that live together in an area |
| ecology | the study of how living things interact with each other ad with their environment |
| population density | the number of individuals in a specific area |
| emigration | leaving a population |
| limiting factor | an environmental factor that prevents a population from increasing |
| carrying capacity | the largest population that an environment can support |
| adaptations | the behaviors and physical characteristics of species that allow them to live successfully in their environment |
| competition | the struggle between organisms to survive in a habitat with limited resources |
| predation | an interaction in which one organism kills and eats another |
| prey | the organism that is killed |
| symbiosis | a close relationship between two species that benefits at least one of the species |
| mutualism | a relationship in which both species benefit: oxpeckers/hippo |
| commensalism | a relationship in which one species benefits and the other is neither helped nor harmed; red-tailed hawk/saguaro cactus |
| parasitism | involves one organism living on or in another organism and harming it; tick/dog |
| photosynthesis | water + carbon dioxide + sunlight = food |
| niche | an organism's particular role |
