Mutations can be transmitted to the next generation if they are present in
(1) brain cells
(3) body cells
(2) sèx cells
(4) muscle cells

(2)

Explanation:

Because the genetic material in these cells is going to be some of the genetic material of the offspring.

"a scientist studying a whale and its surroundings would need to understand the structure of atoms in case something was negatively affecting the whale or its surroundings."

explanation:

this was from the link provided:

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.