Which of these work together in a feedback loop?
A. Thyroid and parathyroid gland
B. Hypothalamus and pituitary gland
C. Adrenal and pineal gland
D. Ovaries and salivary gland

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

the must be sensory neurons.  

hope its .

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

whats the answer to your question?

i think its both a and b