Answer:
b and d btw are you taking an exam? Or test?
Explanation:
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.
My mom always say when in dought pick C so C
Answer:
Sanity and Temperature
Explanation:
They both determine the density of ocean water and density influences the circulation.