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Biology 7 Online
OpenStudy (anonymous):

Identical twins in humans, which are deuterostomes, are formed when cells at the four-cell stage are separated. A grasshopper, which is a protostome, will die if the cells are separated at the four-cell stage. What does this indicate about when the cells are differentiated in the zygote? Why might deuterostomes differentiate their embryonic cells later than the protostomes?

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