Answer:Some common synonyms of busy are assiduous, diligent, industrious, and sedulous. While all these words mean "actively engaged or occupied," busy chiefly stresses activity as opposed to idleness or leisure.
U will not have energy to run or play or do anything maybe not even be able to get out of bed u become super tired and lazy
I believe the answer is B. Cardiovascular efficiency :)
Answer:
heart bc it increases the heart rate
Answer:
They may change in such a way that antibiotics can't kill them
Explanation: