| A | B |
|---|
| ecosystem | all the living and nonliving things that interact in an area |
| organism | an individual living thing |
| habitat | the place where an organism lives |
| biotic factors | the living parts of an ecosystem |
| abiotic factors | the nonliving parts of an ecosystem |
| photosynthesis | the process in which organisms use sunlight, carbon dioxide and water to make food and oxygen |
| soil | a mixture of rock, minerals, air, water and the decaying remains of living things |
| population | all the members of a species that live in a area |
| species | a group of organism that are physically similar and can reproduce to produce fertile offspring |
| community | all the different populations that live together in an area |
| ecology | the study of how living things interact with each other and their environment |
| aspect | the direction a slope faces |
| population density | the number of individuals of a species that live in a specific area |
| estimate | an approximation of a number based on reasonable assumptions and observations |
| birth rate | the number of births in a population in a specific amount of time |
| death rate | the number of deaths in a population in a specific amount of time |
| immigration | moving into a population |
| emigration | leaving a population |
| limiting factor | an environmental factor that prevents a population from growing |
| carrying capacity | the largest population an area can support |
