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In early embryonic development, the cells start to differentiate based on _________________.

their location, or layer

amniotic fluid produced by the placenta

hormones secreted by the uterus

chemicals secreted by the blastocyst

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Their location, or layer
The cells produce three germ layers:
endoderm- becomes the gut
mesoderm- becomes muscle, skeletal system, some organs, and connective tissure
ectoderm- becomes skin and nervous system

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