Clean coal is meant to drastically improve emissions, but no matter how much you treat it, it still creates an environmental impact
A. an explanation based on prior scientific knowledge or observations
i just took the quiz and got the answer correct.
The atria of the heart merely need to allow blood to flow into the ventricle, and therefore aren't very muscular.
The ventricles of the heart need to actually pump blood to the rest of the body, whether to the lungs or the the rest of the body.
The answer is A. The ratio goes down as the size of the cell gets larger.
