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| scientific study of interactions among organisms and between organisms and their enviroment. |
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| part of earth in which life exists including land,water,and air or atmosphere. |
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| group of similair organisms that can breed and produce fertile offspring. |
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| group of individuals of the same species that live in the same area. |
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| assemblage of differnt populations that live together in a defined area. |
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| collection of all the organisms that live in a particular place, together with their nonliving enviroment. |
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| group of ecosystems that have the same climate and dominant communities. |
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| organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds; also called a producer. |
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| process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches. |
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| process by which some organisms, such as certain bacteria, use chemical energy to produce carbonhydrates. |
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| organism that relies on other organisms for its energy and food supply;also called a heterotroph. |
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| organism that obtains energy by eating animals. |
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| organism that feeds on plant and animal remains and other dead matter. |
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| series of steps in an ecosystem in which organisms transfer energy by eating and being eaten. |
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| step in a food chain or food web. |
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| diagram that shows the relative amounts of energy or matter within each trophic level in a food chain or food web. |
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| organism that can capture energy from sunlight or chemicals and use it to produce food from inorganic compounds; also called an autotroph. |
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| organism that obtains energy from the foods it consumes; also called a consumer. |
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| organism that obtains energy by eating only plants. |
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| organism that obtains energy by eating both plants and animals. |
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| organism that breaks down and obtains energy from dead organic matter. |
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| network of complex interactions form by the feeding realtionships among the various organisms in an ecosystems. |
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| total amount of living tissuse within a given trophic level. |
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| process in which elements,chemical compounds,and other forms of matter are passed from one organism to another and from one part of the biosphere to another. |
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| process by which water changes from a liquid into an amtospheric gas. |
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| loss of water from plant through its leaves. |
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| chemical substance that an organism requries to live. |
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| process of converting nitrogen gas into ammoina. |
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| conversion of nitrates into nitrogen gas. |
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| rate at which organic matter is created by producers in an ecosystem. |
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| single nutrient that either is scarce or cycles very slowly, limiting the growth of organisms in an ecosystems. |
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