6. What are biodegradable materials a. These are materials that can be decomposed.
b. These are materials that do not decomposed.
c. These are harmful materials.
d. These are materials that both decomposed and not dec

A

Explanation:

These are the materials that can be decomposed

bc blah

explanation:

bc blah

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)]