The excretory system is most likely to respond when an animal is thirsty in this way: B. by retaining body fluids.
Because the body doesn't get enough fluids to not be thirsty anymore, it retains whatever fluids it already has in it until the thirst is satiated.
D) Stem cells are usually harvested from embryos.
Transpiration is the process where plants absorb water through the roots and then give off water vapor through pores in their leaves, so D would be your answer
