Someone please help me I missed some things in class and I don’t know the answer

The part of a desired plant inserted into rootstock during grafting is called the

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.

I’m stuck on this question cuz i’m stupid sksksksk