What is the basis of the metric measurement system?
a) its measures are based on divisions that are powers of ten.
b) it is based on european measurement standards.
c) it is the only scientific measurement system.
d) it is based on the wavelength of krypton-86 radiation.

The answer is:

A) Its measures are based on divisions that are powers of ten.

Explanation:

The explanation for why this is the answer is that it is true and obvious that the metric measurement system relies on certain divisions and prefixes that are based on the powers of ten such as "centi-" or "milli-". In short, the metric measurement system's basis is being able to have it's measures somewhat "altered" or "adjusted" by these particular prefixes to fit the item or subject or object being measured.

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)]