Dna nucleotides are made up of
a. a sugar group, an amino acid group and a nitrogenous base.
b. a phosphate group, a sugar group and a nitrogenous base.
c. a protein group, a sugar group and a nitrogenous base.
d. a phosphate group, a starch group and a nitrogenous base.

answer; i believe that the correct answer is (lung);

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

the must be sensory neurons.  

hope its .

what's the question ?

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]