What product that is required by plants do animals–as well as plants–produce during cellular respiration?

I'm not sure if this is a multiple choice question. But, my answer would probably have to be, feces. When an animal passes foods, it adds nutrients to the earth, and when plants die they also go into the earth to help fortify and regurgitate it. Hope this helps. :D

Chickens have 39 pairs. Genotype. The genetic makeup of an organism. Phenotype, The observable physical or biochemical characteristics of an organism resulting from its geno type. Examples of aspects of a chicken's phenotype include body shape, feather color, eye color, comb type, and so on.

P.S. (I just did some reasearch so just to let you know..hope it helps.)