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2.Human Reproduction
medium
During the development of embryo which of the following occur first
A
Differentiation of tissue
B
Differentiation of cells
C
Differentiation of organs
D
Differentiation of organ system
Solution
(b) 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.
Standard 12
Biology
