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| Scientific study of interactions among organisms and between organisms and their environment, or surroundings. |
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| The combined portions of the planet in which all life exists, including land, water, and air, or atmosphere. |
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| Group of organisms so similar to one another that they can breed and produce fertile offspring. |
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| Groups of individuals that belong to the same species and live in the same area. |
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| Assemblages of different populations that live together in a defined area. |
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| Collections of all the organisms that live in a particular place, together with thier nonliving, or physical, environment. |
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| Group of ecosystems that have the same climate and similiar dominant communities. |
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| Plants, some algae, and certain bacteria that can capture energy from sunlight or chemicals and use that engergy to produce food. |
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| Orgamisms that make their own food. |
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| Process where plants get light engergy from sunlight |
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| When organisms use chemical energy to produce food in the absence of light. |
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Obtain engergy by only eating plants.
(Cows, deer, caterpillars.) |
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Eat only animals.
{Snakes, dogs, owls) |
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Eat both animals and plants.
(Humans, Bears, crows) |
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Feed on plant and animal remains and other dead matter.
(Mites, earthworms, snails, crabs) |
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| Breaks down organic matter. |
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| Series of steps in which organisms transfer energy by eating and being eaten. |
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| Relationships among the various organisms in an ecosystem form a network of complex interactions. |
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| Each step in food chain or food web. |
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| A diagram that shows the relative amounts of energy or matter contained within each trophic level in a food chain or food web. |
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| The total amount of living tissue within a given trophic level. |
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