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a ductless gland that secretes hormones directly into the bloodstream, to be transported to where they are needed in the body.
the medical condition whereby the body is unable to control the levels of glucose in the blood...
single-celled floating algae, which provide food for marine animals, such as fish and whales....
the inner most layer of the cortex of roots and some stems of plants.
all the chemical reactions involved in maintaining the living state of the cells and the...