Haversian canals (also called central canals) run longitudinally through the bone and contain blood vessels and nerves which supply the bone.
Business casual: Generally means khaki pants, a plain polo shirt or a long-sleeved casual button-down oxford shirt, a V-neck sweater, sometimes a sports coat or blazer, and brown leather shoes. Loafers are a good choice, and you should wear socks.
what is business casual broadly speaking business casual for men means wearing a pair of smart pants a collared shirt a sweater or blazer and relaxed but elegant shoes a tie is generally not needed for business casual occasions however if you are in doubt you should always wear one