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a gland which secretes substances, usually enzymes, through a duct directly to the part of the body where they are needed.
energy resources (coal, crude oil and natural gas) derived from the fossilised remains of plants...
a thick, sticky liquid in which all the other nuclear components are suspended.
the blood circuit from the heart to the body and back to the heart.
(also called herbivore) an animal that feeds directly on plant matter.