I think the answer is C. emulsification.
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Your question: What does the axial skeleton consist of ..?
Your answer: The axial skeleton consists of a trunk of a vertebrae and the bones of the head.
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The answer is 2000 calories. My guess is that is because you need to burn so many but gain so many to get energy. This is a way to not gain weight.
The answer true it is a major cause of injuries