Answer:
B. The spinning motion of Earth.
Answer:
C. An association between two sets of data
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:
B is the answer! Hope this helps :)
