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plant-like organisms that live and grow in water; they make their own organic food by the process of photosynthesis.
structure within the cell cytoplasm that is surrounded by its own membrane and has a specific...
pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during ...
regions or bundles of vascular tissue consisting of xylem and phloem separated by cambium.
a social structure in which different classes are determined by heredity.