Which of the following does not accurately depict a scientific theory? a. theories are supported in many ways. b. theories may be changed or replaced if new evidence is found. c. theories are tested over and over again. d. theories are absolute truths.

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

How can you tell the difference between rough er from smooth er?

Vinegar has a ph of 3, and household ammonia has a ph of 11. is the concentration of h+ greatest in the vinegar or ammonia?