Which definition best describes an acid? A. A substance in a solution that releases and captures hydrogen
ions, keeping the pH the same
B. A substance in a solution that provides color over a narrow range
of pH
O C. A substance in a solution that releases hydrogen ions and lowers
the pH
D. A substance in a solution that captures hydrogen ions and raises
the pH

Explain the side effects of cancer treatments

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.

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi