Q: Which human organ system primarily exchanges gases between the body and the atmosphere?
A: respiratory
Q: A company plants trees on a bare hillside. Which of these is the BEST reason for planting the trees?
A: The trees prevent soil from washing away.
Q: Most of the concentration of which gas results from the activity of producer organisms?
A: oxygen
Q: A genetic mutation has caused the fur color of field mice to contrast with their environment. This type of mutation will most likely
A:
harm the mice.