1. Circle the letter of each sentence that is true about water's structure. a. Water is made up of atoms bonded to form molecules.
b. Water contains half as many hydrogen atoms as oxygen atoms.
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c. Water molecules tend to push away from each other.
d. The chemical formula for water is H20.

hello

answer: collecting information/data

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

i hope this

ya the other dude is right

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.