Question

which statement is scientifically based?
mutations rarely occur.
all mutations are harmful.
some mutations can be contagious, like infections.
mutations are not passed from parent to offspring.

Explanation:

Mutations are changes in DNA. They occur spontaneously at a relatively low - rate, so "Mutations rarely occur" is scientifically based. Not all mutations are harmful; some can be neutral or beneficial. Mutations are not contagious like infections as they are changes in an organism's genetic material. Germ - line mutations can be passed from parent to offspring.

Answer:

Mutations rarely occur.