Answer:
1. 380 parts per million (0.038%)
Explanation:
By volume, dry air, which makes up the earth's atmosphere is roughly made up of 78.09 % nitrogen gas, 20.95 % oxygen gas, 0.93% argon gas, 0.04% carbon dioxide gas, and trace amounts of other gases. So the answer to this question is the one that is closest to 0.04 %, 1.
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Explanation:
hehdjdjdidnrbrbrnrn espero haberlos ayudado
I'm quite sure it's activity level. One other thing that could've been said is metabolism, but that isn't there. However, food is consumed for the body to have energy, and without that energy we wouldn't be able to function. And when we let that intake of food settle, it's stored as fat. But because of activity level, we are capable of burning those calories.
D is the answer you are looking for. <span />