What is always included in a comparative investigation

What was the land like over 500 million years ago? what was under the sea?

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.

What maintain homeostasis when a persons internal body temperature is 97.5°f