The hormone melatonin helps synchronize the sleep-wake cycle by means ofGroup of answer choicesinducing alertness just preceding awakening. stimulating the hypothalamus to activate the sleep cycle. inducing feelings of drowsiness. triggering the SCN when the amount of light striking the retina declines. traveling to the amygdala to activate the sleep cycle.

Rick is a toddler with an easy temperament and active nature. people are often seen stopping to talk to him in supermarkets and parks where his mother takes him in the evenings because he smiles willingly at other children and adults. this aspect of rick’s behavior most likely reflects a(n) active genotype–environment interaction suppressive genotype-environment interaction passive genotype–environment interaction evocative genotype–environment interaction