| A | B |
|---|
| ecology | the study of living things and their environment |
| ecosystem | living organisms and nonliving things in an environment, together with their interactions |
| biosphere | the term referring to the whole of earth as one ecosystem (also known as ecoshpere) |
| community | all populations that live in a certain place |
| population | a group of the same kind of organisms (a population then consist of one species) |
| habitat | the place where an organisms lives |
| niche | organism's role or job in its habitat |
| limiting factor | any condition that keeps the size of a population from increasing |
