Which statement is scientifically based? A. Mutations rarely occur.
B. All mutations are harmful.
C. Some mutations can be contagious, like infections.
D. Mutations are not passed from parent to offspring

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u.s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u.s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u.s.