Difference among species in digestive physiology is due to degree? How do they differ?
eating - specialized mouth structures. type of teeth (grinding cutting), presence/absence of teeth.
digestive tract. diet is based on digestive physiology. Structures, functions from the start of the digestive tract to the end.
absorption of nutrients. - transports and other mechanisms
metabolism of nutrients. - maintenace, production/work.
excretion of waste products.