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.
Life Span and Reproduction The average life span of an eastern cottontail in the wild is usually less than three years. In captivity, though, a cottontail rabbit can live up to eight years.