What do all steroids have in common?
a. they are not lipids
b. they all have the same function
c. they are all sex hormones
d. they are all built on a four-ring

they are all derived from a polycyclic four-ring structure

answer; ///the declaration of independence;

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.