| A | B |
|---|
| habitat | the place where an organism lives |
| niche | the role that the organism does in its environment |
| biotic factors | living things in the organism's environment |
| abiotic factors | non-living things in the organism's environment |
| soil | a mixture of rock fragments, water, air nutrients , and living things |
| population | all the members of a species living in a particular area |
| communities | all the organisms regardless of species living in an area |
| ecology | science of environments, communities and ecosystems |
| limiting factor | resource that acts to prevent a population from growing larger |
| immigration | movement of individuals into an area |
| emigration | movement of individuals out of an area |
| competition | struggle of individuals in an area for resources necessary for survival |
| predator | animal that kills and eats another animal |
| prey | animal that is killed as a food source for another animal |
| symbiosis | a close relationship between organisms in which at least one benefits |
| mutualism | a symbiotic relationship in which both organisms benefit |
| commensalism | a symbiotic relationship in which one organism benefits and the other organism is not affected |
| parasitism | a symbiotic relationship in which one organism benefits and the other organism is harmed |
