$A$ : Development is the emergence of a multicellular organism from a single group of cells.
$R$ : Development involves growth, differentiation and morphogenesis.

How many cleavages are completed in $16$ celled stage of egg.

How many chromosome numbers are present in primary spermatocytes of human ?

To reduce the weight of spermatozoan and enhance its motility nucleus undergoes which of the following change

Hormone injected by doctors to induce delivery is