| A | B |
|---|
| ecosystem | All the living and nonliving things that interact in a particulararea make up an ecosystem. |
| habitat | A place where an animal plant or a person lives. |
| biotic | The living things in an ecosystem |
| abiotic | The nonliving things in an ecosystem. |
| population | All the members of one species in a particular area referred to population. |
| community | All the different populations that live together in an area make up a community. |
| ecology | the study of how living things interact with eachother is ecology. |
| photosynthesis | process of plants and algae make food using water, sunlight, and carbon dioxide. |
| Oxygen | Organisms that live on land get it from the air and fish get it from the water around them. |
| species | is a group of organisms that are physically similar and can reproduce with eachother to produce fertile offspring |
| ecologist | study of how living things interact with each other and with their environment. |
| Population density | number of individuals in a specific area. |
| direct observation | watching a species or event and taking a count |
| indirect observation | counting nesting sites in an area |
| sampling | taking the number in a small area to estimate number in a larger area |
| mark and recapture study | counting an animal with specific markings put on by a person studying them. |
