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the cavity used for transport purposes. It has one opening to the environment through which ingestion and digestion both take place.
to change over a period of time in response to new environmental conditions.
plant-like organisms that live and grow in water; they make their own organic food by the...
the tough connective tissue membrane surrounding bones on the outside. It contains nerves and...
involuntary muscle found in the walls of blood vessels, in digestive, respiratory, urinary and...