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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.
the cone-shaped region of the renal medulla, made up of the loops of Henlé and the collecting...
compounds that consist of any combination of elements, but do not usually contain carbon and...
a type of nuclear division during which reproductive cells divide to produce gametes. The...
organisms that are unable to produce their own organic food and must therefore obtain nutrients...