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Chapter 2 Ecology
| Question | Answer |
|---|---|
| All the living organisms that inhabit an environment. | biotic factors |
| Place where an organism lives out its life. | habitat |
| Symbiotic relationship in which one organisms benefits at the expense of another, usually another species. | parasitism |
| organisms, such as fungi and bacteria, that break down and absorb nutrients from dead organisms. | decomposer |
| Portion of Earth that supports life; extends from high in the atmosphere to the bottom of the oceans. | biosphere |
| Symbiotic relationship in which one species benefits and the other species is neither harmed nor benefited. | commensalism |
| The total weight of living matter at each trophic level | biomass |
| Interactions among populations, the community’s physical surroundings, or abiotic factors | ecosystem |
| A symbiotic relationships in which both species benefit. | mutualism |
| Simple model that shows how matter and energy move through an ecosystem | food chain |
| Group of organisms all of the same species, which interbreed and live in the same place at the same time. | population |
| Role or position a species has in its environment; includes all biotic and abiotic interactions as an animal meets its needs for survival and reproduction. | niche |
| Model that shows all of the possible feeding relationships at each trophic level in a community | food web |
| Organism that cannot make their own food and must feed on other organisms for energy and nutrients. | heterotrophs |
| Collection of several interacting populations that inhabit a common environment. | community |
| Nonliving parts of an organism's environment, air currents, temperature, moisture, light, and soil are examples | abiotic |
| represents a feeding step in the movement of energy and materials through an ecosystem | trophic level |
| Organism that uses energy from the sun or energy stored in chemical compounds to manufacture their own food. | autotroph |
| permanent, close association between two or more organisms of different species | symbiosis |
| Scientific study of interactions between organisms and their environment. | ecology |
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brownbiology
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