Rebecca lives in boston. her friend, serena, just flew in from denver. to serena adjust to the new time zone, rebecca should:

To help Serena adjust to the new time zone, Rebecca should: offer her a dose of melatonin.

Melatonin is a hormone, secreted by the pineal gland in the brain. Melatonin is found in some foods and it is also available as a pill. Melatonin performs various roles in the body. It is involved in the sleep/wake and reproductive cycles in humans. The secretion and release of melatonin in the brain has to do with time of day. It decreases when it is light and it increases when it's dark. The secretion of melatonin in the brain reduces with age.

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?