-Target cells respond to hormome - glandular cells secrete hormone into bloodstream
-bloodstream circulates hormones through the body
-post-synaptic cell responds
-neurotransmitter released into synaptic cleft
-neuron conducts impulse

i would say it is

propane is burned to provide the heat in many cooking grills. the chemical reaction for this process is shown in the equation below.

c3h8 + 5o2 ? 3 co2 + 4h2o + energy

what are the products in this chemical reaction?

3co2 + 4h2o + energy

answerlength of time the medication is in contact with the skin(moistur level of the skin) depth of respirations blood supply to the area; all of the above; ///