It pumps the blood in and out of the heart. If I remember right I think that’s it.
The answer would be TRUE because going through puberty/teenage years can be early in life like for 12 year olds, or normal time, and even in young adult hood because people's bodies are different so we change at different times, not at the same time.
Your question is not clear...please reread your question and retype it.
I believe it is B.) One every 3-5 seconds. This includes all mirrors, not just the rear view, though I may be wrong, sorry if I am!!
