Bone marrow is the soft, fatty tissue inside your bones. The bone marrow produces blood cells. Stem cells are immature cells in the bone marrow that give rise to all of your different blood cells.
The average life pan of a pet rabbit is 6 to 8 years, but they can live up to 15 years. I had my last rabbit for about 12 years.
According to the Standard of Perfection of the American Rabbit Breeders' Association, rabbits are considered adults at the age of 6 months. Rabbits reach sexual maturity around 4 months of age. Rabbits tend to reach a mature size at around six months of age. Males and females reach sexual maturity at different times: females at around 16 weeks and males at around 14 weeks. Large breeds (giants) reach sexual maturity later than the smaller and medium-sized breeds: it could take them as much as 9 months.