The only other NFL-AFL death that has been attributed directly to a hit on the field also occurred in the fledgling AFL. New York Titans rookie offensive guard Howard Glenn, 24, died hours after a game in October 1960 in Houston, the cause of death also cited as a broken neck.
Human is a complex organisms because humans are made up of trillion of cell and a lot of system and organ .Some of the major systems are blood circulatory systems, the skeletal system, the digestive system, the nervous system and the respiratory system.
Chapter 6: THE HUMAN ORGANISM. As similar as we humans are in many ways to other species, we are unique among the earth's life forms in our ability to use language and thought. Having evolved a large and complex brain, our species has a facility to think, imagine, create, and learn from experience that far exceeds that of any other species.