B is the answer?!? Sorry if im wront
Answer:
provide protection against pathogens
Explanation:
C. The Bering Land Bridge once connected what would be Russia and North America but the the movement of these continents separated the land bridge
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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