Biology Quiz
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MOLECULES TO ORGANISMS: STRUCTURES AND PROCESSES
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A fertilized egg (zygote) divides many times to form an embryo. Early on, the cells are very similar, but later the embryo contains nerve cells that send signals, muscle cells that contract, skin cells that form a protective barrier, and blood cells that carry oxygen. These different cell types still contain the same DNA. What best explains how these cells become so different?
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