The answer that would best complete the given statement above would be the second option: replaced. Damaged cells of an organism are usually REPLACED by mitosis. Mitosis is a process of cell division which is a part of a cell cycle. Hope this answers your question.
answered: Guest
answer; i believe the correct answer is ( proteins );
Of your good in bio kusing a series of preliminary observations; pstate a problem developed from these observations, formulate a hypothesis, design an experiment to test the hypothesis