Answer:
Antibodies and T-cells are both immune cells.
Answer:During pregnancy, red blood cells from the unborn baby can cross into the mother's blood through the placenta. If the mother is Rh-negative, her immune system treats Rh-positive fetal cells as if they were a foreign substance. The mother's body makes antibodies against the fetal blood cells
Explanation:
Is there a question for this
Answer:
You use the metric system
Explanation:
Its used all around the world and what is supposed to be used for scientific results.