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.

The correct option is C.

A scientifically based statement refers to a statement that can be proven or that can be examined scientifically. This type of statement usually support scientific investigations and is based on facts. For the question given above for instance, it can be scientifically proven that certain mutations can be contagious just like infections.

b. the carbon cycle ensures living things have a source of hydrogen

maritime tropical may be your answer.