most organ systems are innervated by both the sympathetic and parasympathetic nervous systems, a feature known as dual innervation. Why is this a useful adaptation

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

the backbone of the dna and rna compound is sugar phosphate.

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

the must be sensory neurons.  

hope its .