Which is the primary advantage of instincts, such as the tendency of a mother bear to attack anything between herself and her cubs? a) they improve survival rates. b) they reduce predator contacts. c) they improve food selection choices. d) they allow for smaller brains and less wasted energy.

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.