Help is appreciated thank you

Which of the following correctly list the first appearance of organism in the fossil record from earliest to most recent

At which location in earth’s interior does the top density continue to increase as thickness decreases?

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.