Early Animal Embryos Are Composed of Stem Cells, Unspecialized Cells

Early animal embryos are composed of stem cells, unspecialized cells that are capable of dividing and renewing themselves for long periods. If a stem cell divides by mitosis so that one cell eventually becomes part of the brain and the other cell becomes part of a salivary gland, the cells have

A) lost genes.
B) differentiated.
C) diffused.
D) taken up genes from surrounding cells.
E) increased their genetic variability.

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