| A | B |
|---|
| biosphere | crust, earth, atmosphere |
| ecosystem | all living and nonliving organisms in an area |
| ecologists | people who study interactions between organisms and their environment |
| community | all populations in an ecosystem |
| population | all the organisms in the same species |
| habitat | place where an organism lives that gives it food & shelter |
| competition | two or more organisms seek the same resources at the same time |
| limiting factor | restricts population |
| carrying capacity | largest number of organisms an ecosystem can support |
| exponential growth | grow rapidly |
| photosynthesis | used by process green plants use to make energy |
| producers | green plants that make energy |
| consumers | cannot make energy |
| sample counting | way to estimate size |
| population density | number of individuals in a given area |
| niche | role a species plays in a community |
