Some humans can wiggle their ears. This trait is not relevant to the survival of humans. What does
the existence of unused structures, such as
muscles around the ears, suggest about the
ancestry of humans?
O A. Humans evolved from chimpanzees, who
use their ear muscles to find food.
B. Ear muscles may help humans survive as
conditions on Earth change.
O C. Humans evolved from an earlier species
that had ear muscles, which were
important to the survival of the earlier
species.
D. Humans in the 18th century moved their
ears as a way to communicate.

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.

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