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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.
when a person uses their breath to help another person who has stopped breathing, in an attempt...
small solid particles of matter such as soot, ash, metal and dust.
the process whereby nutrients that have been absorbed from the digestive system are taken up by...
a molecule that is converted to adenosine triphosphate (ATP) for energy storage.