MCQ
The main function of the skin of frog is:
- ✓The exchange of respiratory gases.
- BThe storage of fat.
- CThe storage of energy.
- DTo convert light vitamin $D.$
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$(I)$. pre and postsynaptic neurons are in very close proximity
$(II)$. pre and postsynaptic neurons are separated by synaptic cleft
$(III)$. impulse transmission is very fast
$(IV)$. electrical synapses are common in our system
Select the correct option
$R-$ During meiosis the genetic material is replicated twice and cell divides twice.