1. An atom has 57 neutrons and 42 protons. How many electrons will this atom have if it neutral?
57
44
42
40

Earth's rotation cause the global convention current between the equator and the poles

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.