A circadian cycle is about __________ hours long

Martin thought his infant was watching the toy train all the way in the back of the store. Assuming that Martin's son is under 6 months, it is unlikely that he was watching the distant toy train due to his inadequate

a. depth perception. c. distance vision. b. binocular vision. d. monocular vision.

A difference between Einstein's brain and the average brain is that:

a. It was larger in size b. It was lighter in weight c. There were more neurons d. There was no difference