During the development of embryo, which of the following occurs first?
A
Differentiation of organ
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B
Differentiation of tissue
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C
Differentiation of organ system
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D
Differentiation of cells
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Solution
The correct option is C Differentiation of cells After fertilisation, the zygote undergoes the process of cleavage to form a number of cells which ultimately undergo the process of differentiation and then form tissues, organ and lastly organ systems.