The sternum is the flat bone in the middle of the chest that connects to the collar bones (clavicles) and the ribs. to which skeletal system does the sternum belong? spongy skeleton compact skeleton axial skeleton appendicular skeleton

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.