"which statement best describes an activity performed by a student investigating an abiotic factor using this setup?
(1)he records the temperature of the water.
(2)he feeds the fish 0.5 gram of fish food twice a day.
(3)he measures the growth of the plants with a metric ruler.
(4)he observes the snail scrape algae off the gravel."

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.