Which of the following structures helps retain fluids in the body? a. Bone
B. Muscle
C. Skin
D. Joint
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C. Skin

Explanation:

The integumentary system consists of the skin, hair, nails, glands, and nerves. Its main function is to act as a barrier to protect the body from the outside world. It also functions to retain body fluids, protect against disease, eliminate waste products, and regulate body temperature.

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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.