| A | B |
| Ecology | study of the interaction of species |
| Species | a group of animals or plants that have certain characteristics in common |
| Community | a group of animals in a same area |
| Ecosystem | a group of communities of living thing |
| Abiotic factor | physical/environmental factor such as water, temp, soil, and light that influences the compostion of a ecosystem |
| Biotic factor | pertaining to lige of specific life conditions |
| Saprophyte | an organism that feeds on decaying organic matter |
| Herbivore | plant eater |
| Omnivore | eats both plants and meat |
| Carnivore | meat eater |
| Symbiosis | living together of 2 disimilar organisms for a mutual benefit |
| Commensalism | relationship in which only one organism benefits and the other organism is unaffected. |
| Mutualism | mutually beneficial relationship between different kinds of organisms |
| Parasitism | density dependant factor for population size in which harmful organisms live on or in a host of organism, from which they draw nourishment |
| Producer | food producing member of a community |
| Consumer | Organism in a community that i unable to produce its own food |
| Decomposer | organism that derives nourishment by feeding on dead organisms and waste products of living organisms |
| Niche | in an ecosystem/ a unique place in which occupied by a organism, in relationship to all the biotic and abiotic factors. |
| Competition | fighting over resources |
| Biome | one of the distinctive geographical regions of the world, characterized by a dominant plant and animal lifeforms maintained by a simlar climate |