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.
Correct Answer:
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