The placenta provides oxygen to the baby and excretes carbon dioxide into your bloodstream.
meaning that the baby does not simply absorb oxygen from a women's bloodstream. blood and gas transports occur through the placenta, also the placenta delivers oxygen-rich blood through the umbilical vein not artery
hope this helps
D. ecosystem to biome
biome would be like a whole desert but an ecosystem would be a small part of that
Teh answer is c. The human skin cell.
It contracts on its own without input. The answer is C.
Hope that helped you.
