During cellular respiration every living thing in this food web uses gas and releases back into the environment

B) oxygen:carbon dioxide, because of the process of Cellular respiration, the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining processes and discarding, as waste products, carbon dioxide and water.

Explanation:

you dont brother god luck

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

the must be sensory neurons.  

hope its .