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
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The carbon cycle is nature's way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again. Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms.
Explanation: i hope this helped
<span>Statistically, which adolescent is most apt to experience menarche first? The </span> Answer Is ( C)
consumers use producers as a source of energy
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sorry I don't know much but all I know is how neurons communicate once a stimulus is detected and I hope it helps. once a stimulus is detected the skin receptors signal the sensory neurons to carry the stimulus to the central nervous system. The relay neurons relay the stimulus to the motor neuron and the motor neuron transfers it to the effector. and the effectors produce a response
