Episode 4: The Generation of the Wolf
Bone marrow – Soft tissue in the hollow interior of bones. In adults, bone marrow in large bones produces new blood cells. Bone marrow composition is one way that biologists can study what the health of an animal was when it died.
Did You Know?
Prior to the establishment of the National Park Service, the U.S. Army protected Yellowstone between 1886 and 1918. Fort Yellowstone was established at Mammoth Hot Springs for that purpose.