6. What is the building block of each of the four classes of organic molecules? The building blocks of carbohydrates are
The building blocks of lipids are
The building blocks of proteins are
The building blocks of nucleic acids are
7. What is a polymer?

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]