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| nonliving component of an ecosystem, such as air, water, light, minerals, or temperature |
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| physiological adjustment that occurs gradually, though still reversibly, in response to an environmental change. |
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| A cell present in adult tissues that generates replacements for non-dividing differentiated cells |
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| relative number of individuals of each age in a population |
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| The formation of a new species as a result of an ancestral population becoming isolated by a geographic barrier. sympatric speciation. |
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| Member of a class of vertebrate animals includes frogs and salamanders |
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| a segmented worm. Includes earthworms, polychaetes, and leeches |
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| A sac in which pollen grains develop, located at the tip of a flower's stamen |
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| member of a primate group made up of the apes (gibbons, orangutans, gorillas, chimps, and bonobos), monkeys, and humans |
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| region of an aquatic ecosystem beneath the photic zone, where light levels are too low for photosynthesis to take place |
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| member of a major arthropod group that includes spiders, scorpions, ticks, and mites |
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| member of the most diverse phylum in the animal kingdom; includes horseshoe crap, arachnids, millipedes, centipedes, and insects. Arthropods are characterized by a chitinous exoskeleton, molting, jointed appendages, and a body formed of distinct groups of segments. |
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