I think it's the correct answer is D, thought it could be C as well
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:
Matter cannot be generated or destroyed, according to the Law of Conservation of Matter. Because the same carbon atoms are recycled throughout the carbon cycle, it is an illustration of the Law.
Like what our backyards look like
if so then my backyard has tons of flowers and a big white shed
If you used a radioactive label to trace the pathway of carbon through cell respiration, the label would begin in glucose and en in co2. TRUE