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a gut with two separate openings - a mouth and an anus.
chlorofluorocarbons (CFCs) are organic compounds that contain carbon, chlorine and fluorine.
specialised heart muscle tissue between the right atrium and right ventricle which conducts the...
a biological membrane that separates the interior of all cells from the outside environment.
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...