Answer:
Explanation:
After doing some g0ogle searches, I believe C is incorrect. Stated from g0ogle, "Commercial jet aircraft fly in the lower stratosphere to avoid the turbulence which is common in the troposphere below. " It seems to me that jets avoid the troposphere, which is below. <3
You breathe in oxygen, you exhale carbon dioxide.
It is safe but you shouldn't breathe in carbon dioxide all the time.
<span>B. tiny structures in the cell that carry out the cell's activities</span>
The right choice would be A
