Anders is in his mid-fifties. anders can expect that he will experience a gradual decrease in

List two limitations of natural selection

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?