Based on scientific research, which statement best describes mutations? Mutations are rare occurrences.
Mutations are always harmful.
Mutations cannot be inherited.
Mutations cannot be acquired.

a

explanation:

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.