Animals store glucose in the cells and muscles and excess glucose is stored in the liver as glycogen.
In humans, the yolk sac is the
site of origin for blood cells and primordial germ cells. The human yolk sac is
a membrane located outside the embryo and it is connected by a tube through the
umbilical opening to the embryo's midgut. The yolk sac serves as an early site
for the formation of blood and in time, is incorporated into the primitive gut
of the embryo.
The answer is D because its comparing and the other will just be listing
I guess because of concentration.....it stops !
