It's called chemical reaction.
(I'm not real sure)
The answer is B because convection is the transfer of heat without two objects touching.
D. A mole digging tunnels in the ground
Answer:C. connects the two atria in the fetal heart
Explanation: The foremen ovale makes it possible for blood to go from the vein to the right side of fetus heart,and then to the left side of the heart. Before a baby is born,the baby gets blood rich in oxygen from the mothers placenta,and its delivered through the umbilical cord, because the baby can not use its lungs to get blood.
