The structure of which organic molecule is characterized by a glycerol backbone and fatty acid tails? Lipids
Carbohydrates
Proteins
Nucleic acids

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

cell division is not regulated in tumor cells.

the correct answer would be false.