Utilizing ultisols for agriculture requires a. extensive irrigation b. fertilizer to balance the high alkalinity of the soil c. adding organic matter to supplement the shallow horizons d. fertilizer to replace nutrients that leach from the soil

Utilizing ultisols for agriculture requires - fertilizer to replace nutrients that leach from the soil.

Option D is correct.

d is the answer

sorry if its wrong!

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

the must be sensory neurons.  

hope its .