Which of the following is an embryonic connective tissue
Endometrium
Mediastinum
Mesenchyme
Endothelium
Precocious puberty is
$A$ : Development is the emergence of a multicellular organism from a single group of cells.
$R$ : Development involves growth, differentiation and morphogenesis.
Identify $A, B$ and $C$ in the given human sperm diagram
How many sperms are formed by four primary spermatocytes?
The cavity of gastrula is called