In humans, after a cell differentiates, or becomes specialized, a. it can only function for a few hours before it must be replaced. b. it is no longer functional in the body and must be destroyed. c. it usually can no longer change to become a different type of cell. d. it can change to become a different type of cell whenever it needs to.

Calvin ate a candy bar, which caused his body's blood glucose levels to become unbalanced. his body responded by initiating a feedback mechanism to return his body to homeostasis. place the steps of this feedback mechanism in order, starting with the blood glucose imbalance that occurred after calvin consumed the candy bar. a) calvin's blood glucose levels decreased. b) calvin's pancreas stopped secreting insulin. c) calvin's body cells started to take up glucose and store it as glycogen. d) calvin's blood glucose levels increased. e) calvin's pancreas started secreting insulin.

Which characteristics are typical of a human population in the postindustrial stage?

What is responsible for the uneven heating between the poles and the equator on any given day