Which of the following is the best evidence to support the theory that Lucy’s genus, Australopithecus, evolved into the genus homo? a. Lucy lived millions of years ago.
b. Pre-human species had brains.
c. 40% of Lucy’s skeleton survived.
d. Lucy walked upright on two feet.

C is the answer due to all the information i looked at

Because without physical activity, the body has extra "energy" if you will, and so when it is time for bed you are not tired, so you end up staying up all night. also there is probably an effect on your internal clock, which messes with your melatonin production which goes hand in hand with your sleep cycle

Answerweight and height;