Which organ System - Which is made up of glands which release
hormones into the bloodstream – works with the nervous systems to
regulate body temperature and blood pH levels and blood sugar
levels?

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?