Plants gather energy from the sun to photosythensize any more details from the question
The answer is Osteon. Osteons<span> are several millimeters long and about 0.2 millimeter in diameter; they tend to run parallel to the long axis of a bone. The </span>osteon<span>units of bone are made up of Haversian canals (HC) and Volkmann canals (VC), which run perpendicular to the long axes of </span>osteons<span> and connect adjacent Haversian canals.</span>
Answer:
it is important for the skills to have hole thought the bone because it is used to relieve pressure on the brain when fluid, such as blood builds up and starts to compress bone tissues
