Cholesterol belongs to which class of molecules?
a. protein
b. lipids
c. carbohydrates
d. nucleic acids

   Lipids

Explanation:  Cholesterol is a type of lipid, in addition to triglycerides, which are simply fats. Cholesterol can be found in meat, so in all types of meat with fat, then in egg yolk, etc. In fact, cholesterol is half the lipid half protein, and there are some types of cholesterol known as lipoproteins, so cholesterol spreads through the body inside the lipoprotein, The high amount of cholesterol in the body is harmful, it can contribute to many diseases.  However, there is a so-called "good" cholesterol that helps transport cholesterol through the liver out of the body and thus does not accumulate in the arteries. The accumulation of harmful cholesterol in the arteries leads to obesity, high blood pressure, heart disease, etc.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.