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extremely small infectious particles that can only reproduce inside a host cell.
an animal that feeds directly on secondary consumers.
the end part of the digestive system that consists of the caecum, colon, rectum and anus.
the structure that separates the right ventricle from the pulmonary artery. It prevents the...
an animal that eats only meat.
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...