MCQ
T-lymphocyte originates in :
- ALiver
- BThymus
- ✓Bone-marrow
- DBoth (b) and (c)
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$I$. There are no favourable seasons in tropics
$II$. Less solar energy is available in tropics
$III$. Rate of extinction is low in tropics
$IV$. Resource availability is higher in tropics
Choose the correct option