What is the function of the placenta? a. it protects the vagina. b. it fertilizes an egg. c. it nourishes the embryo. d. it covers the cervix.

Glycogen is an energy-storage molecule in humans. a hormone that is called insulin controls the storage of glycogen in the liver. insulin is made up of amino acids.

Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. release your mouse button when the item is place. if you change your mind, drag the item to the trashcan. click the trashcan to clear all your answers. show the flow of energy in the following ecosystem by labeling each organism's link in the food chain. click once to select a label. click again to place the label in the correct location.

Color blindness is a recessive sex linked human trait. if a color blind father and a mother with normal color vision have a color blind son what must be the mothers genotype? a. xn yn b. xn xn c. xn y d. xn xn