Which level of organization includes living and nonliving things?

In which situations is the principle of cross-cutting relationship useful in determining relative age?

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.

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?