What is the function of cholesterol? to keep the cell membrane from falling apart
to line the arteries of organisms
to store energy
to give us quick energy

to store energy

Explanation:

Its main function is to maintain the integrity and fluidity of cell membranes and to serve as a precursor for the synthesis of substances that are vital for the organism including steroid hormones, bile acids, and vitamin D. Cholesterol is essential for making a number of critical hormones, including the stress hormone cortisol. Cholesterol is also used to make the sex hormones testosterone, progesterone, and estrogen. 2 The liver also uses cholesterol to make bile, a fluid that plays a vital role in the processing and digestion of fats.

layer 3 is younger than layer 6.