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| Study of all the interactions among organisms and their environment. |
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| Any nonliving part of the environment, such as water, sunlight, tempurature, and air. |
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| Any living or once-living organism in the environment. |
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| All of the individuals of one species that live in the same place at the same time. |
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| All of the populations of different species in a given area that intercact in some way and depend on another for food, shelter, and other needs. |
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| All of the communities in a given area and the abiotic factors that affect them. |
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| Part of the Earth that supports life - the top part of Earth's crust, all the waters covering Earth's surface, snf the surrounding atmosphere; includes all the biomes, ecosystems, communities, and populations. |
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| Number of individuals in a population that occupies an area of limited size. |
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| Any biotic factor that limits the number of individuals in a populations. |
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| Any close interaction among two or more different species, including mutualism, commensalism, and parasitism. |
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| Role of an organism in the ecosystem, including what it eats, how it interacts with other organisms, and how it gets food. |
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| Place where an organism lives. |
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| Model that describes how energy passes from one organism to another. |
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| Model that describes how energy from food moves through a community; a series of overlapping food chains. |
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| Continuous cycle of water molecules on Earth as they rise into the atmoshere, fall back to Earth as rain or other precipitation, and flow into rivers and oceans through the process of evaporation, condensation, and precipitation. |
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