It is probably the l<span>amellae.
The lamellae are sheets of bony matrix. This bony matrix is produced by o</span>steoblasts, which are cells that synthesise collagen<span> and specialised proteins like </span>osteocalcin<span> and </span>osteopontin. These are then the most important constituents of the bony matrix.
Sugar group, phosphate group and nitrogen bases.
Because they loss more blood than men and it needs to be replaced by another.
Your answer would be c. 50. Remember the 10% rule. Multiply 500 times .10 and get 50