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| Any of various chiefly aquatic, eukaryotic, photosynthetic organisms, ranging in size from single-celled forms to the giant kelp. Algae were once considered to be plants but are now classified separately because they lack true roots, stems, leaves, and embryos. |
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| An animal that feeds chiefly on plants. |
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1. A flesh-eating animal.
2. Any of various predatory, flesh-eating mammals of the order Carnivora, including the dogs, cats, bears, weasels, hyenas, and raccoons.
3. One who victimizes or injures others; a predator.
4. An insectivorous plant. |
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| To become broken down into components; disintegrate. |
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| The process in green plants and certain other organisms by which carbohydrates are synthesized from carbon dioxide and water using light as an energy source. Most forms of photosynthesis release oxygen as a byproduct. |
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| A complex of interrelated food chains in an ecological community. Also called food cycle. |
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| The number and variety of organisms found within a specified geographic region. |
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| Ecology A photosynthetic green plant or chemosynthetic bacterium, constituting the first trophic level in a food chain; an autotrophic organism. |
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| An animal, such as a bird or insect, that feeds on dead or decaying matter. |
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| An animal hunted or caught for food; quarry. |
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| An increase in the average temperature of the earth's atmosphere, especially a sustained increase sufficient to cause climatic change. |
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| the layer of ozone that hangs in the atmosphere from 20 to 40 miles above the surface of the earth and protects the earth from excessive ultraviolet radiation. Some experts claim that the manufacture of various chemicals. |
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| an animal that derives its life support by predation. |
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| a natural environment where an organism, including a human being, may live and grow normally. |
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| The study of the detrimental effects of modern civilization on the environment, with a view toward their prevention or reversal through conservation. |
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| pertaining to life or living matter. |
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| To be paired for reproducing; breed. |
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| an ecologic sequence in which the various organisms within a community subsist on organisms lower in the sequence, as the human eats the fish that eats the worm, and so on. Each level within the chain has a fundamental role, and destruction of any one member affects the rest of the chain negatively. |
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| a plant or animal that lives upon or within another living organism at whose expense it obtains some advantage |
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