Mutations can be inherited if

Explanation:

Some mutations are hereditary because they are passed down to an offspring from a parent carrying a mutation through the germ line, meaning through an egg or sperm cell carrying the mutation. There are also nonhereditary mutations that occur in cells outside of the germ line, which are called somatic mutations.

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they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom