2.
the body system known as the body’s “command center” is the
nervous system.
muscular system.
skeletal system.
cardiovascular system.

To be honest, I'm not that sure on which one it is, but given choices lead me to think is the nervous system, probably because that's the reason our bodies are functioning, and compared to all other systems, the brain and the nervous system are needed for survival, otherwise you wouldn't be living.

By placing 2 fingers at the sternum (the spot where the lower ribs meet) the put the heel of your other hand next to your fingers. hope this

Ithink the answer is talking about their problems