The basic unit of Compact Bone is an  osteon , which is also known as a  Haversian System . Each Haversian System (unit) has a cylindrical structure that consists of four parts: 1  A central tube called a Haversian Canal, which contains blood vessels and nerves.2  The Haversian Canal is surrounded by alternate layers of:here are two main types of bone tissue, compact bone and spongy bone. Individual bones in the body can be formed from both of these types of bone tissue. The diagram on the right shows the physical structure of a typical  long bone .
Definition of roe 1: the eggs of a fish especially when still enclosed in the ovarian membrane 2: the eggs or ovaries of an invertebrate (such as the coral of a lobster)
Roe is fish eggs.   ----     Roe is fish eggs, yes, but in this circumstance I believe roes is referring to roe deer. http://en.wikipedia.org/wiki/Roe_deer, as in â¦ a herd of roes   Roe when referring to the eggs of a fish doubles as the singular and plural, like fish and deer and you get the point.OD is a fish. COD is also a great game on all platforms. you can kill people on it and heve great fun with your friends camping and anoying noobs. ^ 'Call Of duty' by the â¦ way well that's not obviouse is black ops is a sick game na mw3 is the best.