What are the advantages of ground water

ground water generally does not get polluted because it out of reach from people who would pollute it. while percolating through sand & stones it acts as a natural filter so groundwater remains pure and clean.

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

the must be sensory neurons.  

hope its .

the answer is c.) there is a warm front in region a and a stationary front in region b.