MCQ
The least toxic nitrogen waste present in urine is:
- AAmmonia
- BAllantois
- CUrea
- ✓Uric acid
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$(a) C _{4} H _{6} O _{5}$ $(b) C _{6} H _{12} O _{6}$ $(c) C _{18} H _{36} O _{2}$ $(d) \;Succulents \;(night)$

$(I)$. 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