5. What is Virus ? Explain.
वाइरस क्या है ? समझाइए।​

A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism.

i think that d. wind is the answer.   i missed the question when i answered a. currents.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .