Hormones are chemical substances that help to regulate processes in the body. Hormones are secreted by glands and travel to their target organs in the bloodstream. Hormones can be used to control human fertility.
A physical factor that influences an ecosystem is called an "abiotic factor."
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Sagittal plane, imaginary plane dividing the human body into left and right halves. Sagittaria, a genus of about 20 species of aquatic plants. Sagittarians (disambiguation) Sagittarius Aiolos, a character in Saint Seiya.
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Its not really taught in schools that much.
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