What is a chemical bond?

a. a substance that's composed of atoms
b. a representation of chemical properties
c. the attraction of two atoms that holds the atoms together
d. the force that holds together the elements in a compound

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?

Which of the following is a macronutrient? carbohydrates lipids amino acids all of the above

(amoeba sisters video recap: pedigrees and need