Babies coo before they make repetitive sounds using consonants. This is also known

What aspect of circadian rhythms might explain why we tend to feel so tired at night?

a) Body temperature bottoms out on Monday mornings. b) The three biorhythm patterns converge at low points on Mondays. c) Heart rates typically increase at night. d) There is an organ in the brain sensitive to light changes, which then affects our sleepiness.

Miles took a personality assessment test and the results indicated he was a stable, outgoing extrovert. Six weeks later he took the same test, only this time the results indicated he was moody, difficult to get along with, and socially withdrawn

The test Miles has taken is: a) not valid. b) not reliable. c) biased. d) non-standardized.