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a substance that consists of two or more chemically joined atoms.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
the internal supporting framework made of cartilage and/or bone. This type of skeleton occurs in...
the site where a nerve impulse is transmitted from one neuron to the next. There is no physical...
minute pores in the epidermis of a leaf or stem which allows for movement of gases and water...