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(A) The structure of a neuron, showing the dendrites, nerve cell body, and axon. (B) Photomicrograph
Living systems such as the human body consist of closely interrelated elements
Sleep Requirements Change with Age
A Healthy Daily Food Plan A variety of foods from each group creates a well-balanced diet
The body’s survival depends on mechanisms that maintain internal homeostasis
Energy requirements of an uncatalyzed versus an enzymatically catalyzed chemical reaction