In the third week of development of a human embryo, cells begin to develop unique structures and functions, such as muscle cells, nerve cells, and blood cells.

Which statement best explains how different cell structures can develop from the same cells?
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Development and differentiation result in the loss of some genes.


The embryo's cells create new genes depending on which structure it needs to form.


The cells have different genes depending on the embryo's stage of development.


The embryo's cells express different genes at different times for each structure.