Which example shows a a physical change a. rust b. digesting food c. a burning candle d. melting ice

When analyzing tree rings, what do scientists assume a thin ring indicates?

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.

Jane has a sprained ankle, and her doctor gave her a prescription that states: “ibuprofen caps 200 mg tid po.” what does this prescription say, in spelled-out form?