B. Lysosomes. Please rat my response and have a nice day!
Bones
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Answer: As each cell differentiates, the <em>DNA </em>changes so that each type of cell has different <em>DNA</em> once it reaches maturity. Mutations in the cells’ nuclei lead to new combinations of <em>DNA</em>, resulting in different shapes and functions in the different types of cells.
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Echinoderms are most closely related to chordates because both are: <span>D)Ectotherms</span>
