Answer:
It is B, data.
Explanation:
Data is what you collect from an experiment.
According to science, D would be the correct answer. Hope this helps!
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 correct answer is b. Glad to have helped
