A) Differentiation of tissue
B) Differentiation of cells
C) Differentiation of organs
D) Differentiation of organ system
Correct Answer: B
Solution :
Blastula differentiate into various regions and cells (blastomeres) of a particular region form a particular part of adult body, hence these areas are called presumptive areas and at this stage if cells of a particular area are removed the adult lacks a particular part from its body.
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