When division of the zygote reaches the eight-cell stage and the planes of cleavage of...

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Biology

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When division of the zygote reaches the eight-cell stage and the planes of cleavage of the upperfour cells line up with those of the bottom four cells so that two tiers of cells result, one directlyabove the other, the type of cleavage is calledO spiral cleavage.radial cleavage.direct cleavage.O indirect cleavage.protostome cleavage.

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