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| The part of the world in which life can exist. |
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| The complex of a community of organisms and its environment functioning as an ecological unit. |
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| An interacting population of various kinds of individuals (as species) in a common location. |
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| the whole number of people or inhabitants in a country or region. |
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| A complex structure of interdependent and subordinate elements whose relations and properties are largely determined by their function in the whole. |
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| A group of organs that work together for a vital function. |
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| A structure made up of different tissues all in the use of one function. |
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| A cooperative unit of many similar cells that perform a specific function within a multicellular organism. |
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| A basic unit of living matter separated from its environment by a plasma membrane. |
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| A specialized cellular part (as a mitochondrion, lysosome, or ribosome) that is analogous to an organ. |
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| The smallest particle of a substance that retains all the properties of the substance and is composed of one or more atoms. |
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| One of the minute indivisible particles of which according to ancient materialism the universe is composed. |
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| Autotrophic organism (as a green plant) viewed as a source of biomass that can be consumed by other organisms. |
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| Organism requiring complex organic compounds for food, which it obtains by preying on other organisms or by eating particles of organic matter. |
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| Any of various organisms (as many bacteria and fungi) that return constituents of organic substances to ecological cycles by feeding on and breaking down dead protoplasm. |
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