| A | B |
|---|
| biosphere | part of the earth and all living things in it |
| Ecology | Study of interactions that take place among organisms and the environment |
| Abiotic | Nonliving and physical features of the environment |
| Biotic | Living organisms |
| Population density | Siz of the population occupying a certain area |
| Limiting factors | Any abiotic or biotic factors that restrict population growth |
| Carrying capacity | largest number of individuals in an environment |
| Biotic potential | number of individuals a female in the population can reproduce under the best conditions |
| Symbiosis | Close relationship between 2 different species |
| Mutualism | Relationship that benefits both species |
| Commensalism | Relationship that benefits one, but does not affect the other |
| Parasitism | Relationship that benefits one and harms the other |
| Habitat | Physical location of the organism |
| Niche | Role of the organism |
| ecosystem | Group of communities and its abiotic factors |
| Community | Groups of different species living together |
| Population | Group of indivuals of one species living together |
| Food chain | simple way of showing how energy moves from one organism to another |
| Ecological pyramids | A model used to show the transfer of energy |
| Food web | overlapping food chains |
