How does cell differentiation allow for more complex life forms?

Students in biology are studying the macromolecules of life. they used a calorimeter to determine the calories in various types of food. once the lab was completed, the students ate the left over food samples. monica commented that in just 6 or 7 "chews" of the saltine, it was gone; nothing but a sticky paste in her mouth. elaborate on what happened chemically while chewing the saltine. include the macromolecules present.

If animal agriculture was eliminated, how much grain would become available for human consumption?

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?