In human beings,at the end of $12$ weeks (first trimester) of pregnancy,which of the following is observed?

  • A
    Movement of the foetus
  • B
    Eyelids and eyelashes are formed
  • C
    Most of the major organ systems are formed
  • D
    The head is covered with fine hair

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During embryonic development,after the third cleavage,the number of blastomeres formed will be . . . . . . .

During pregnancy,the levels of which hormones are increased?

During gastrulation,a cavity is formed and is found in the mature gastrula. What is it called?

The type of cleavage found in mammals is:

The amnion of the mammalian embryo is derived from:

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