(B) In $Ascaris$,the life cycle involves four moultings:$1$. The $1^{st}$ moulting occurs in the soil.$2$. The $2^{nd}$ moulting occurs in the intesti

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(B) In $Ascaris$,the life cycle involves four moultings:$1$. The $1^{st}$ moulting occurs in the soil.$2$. The $2^{nd}$ moulting occurs in the intestine of the host.$3$. The $3^{rd}$ and $4^{th}$ moultings occur in the lungs.Therefore,the $3^{rd}$ moulting takes place in the lungs.