(25 Points, PLS HELP) If all proteins are made from the same 20 amino acids, why do they all have very different structures?

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

Select the correct answer. which term do biologists use to describe the average number of individuals of a species per unit area? a. carrying capacity b. population density c. minimal viable population d. survivability curve

Which structure in the cardiovascular system connect arteries to veins?