It can put them in a horrible head space due to online school and not being able to socialize as much
Answer:
your answer would be sinus node (also called the sinoatrial node, or SA node).
Explanation:
I would say A. Because c and d r very dangerous if u think about it. And b is right in some situations. But if u do a then people can see whts going on if something happened because of the light. and it is safe. If wrong let me know. :D
A I think it would be muscles and bones