The answer is D, all the time
OK the the answer you are looking for will be the excretory system because that is the system that releases waste.
This is because Pangaea explains that once there was one huge country that expanded across the whole world, but it split apart and animals that were once next to each other were drifting apart to other parts of the world where both would survive on both sides.
This is true. I'm not sure what you're question is exactly, but that statement is true.
Answer: A. ionic
In ionic bonds electron are transferred from one atom to another. In ionic bonds , the metal atom loses electrons to become positively charged cation whereas the nonmetal atom accepts those electrons to become negatively charged anion.
