All of the following are features representing blastula except
A. each cell is in contact with a different set of neighboring cells.
B. some blastomeres are larger than the others and thus not equivalent.
C. differentiation into notochord and the hollow nerve chord takes place.
D. different blastomeres receive different components of the egg cytoplasm.
E. some blastomeres may divide slower than others depending on the amount of yolk.
Ans: C. differentiation into notochord and the hollow nerve chord takes place.
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