Answer:
1 speedometer 2 wheel 3 gas 4 temp 5 rpm 6 turn signal 7 ??? 8 horn 9 ???
Explanation:
A common answer would be either depression or post-traumatic stress disorder.
Eating habits for sure. Also metabolism and genetics play a big roll in it.
The body already produces enough protein to get by just fine. However, many people think athletes "use up" too much protein and faster than they gain it back, but that is not true because the body regulates homeostasis. I hope I helped :)