Birds, reptiles, amphibians and egg-laying mammals share a common feature, which is what?
Gastrointestinal tract calf-intestinal alkaline phosphatase (CIP), and are used to make goldbeater's skin. Other uses are: Many birds and other animals have a specialised stomach in the digestive tract called a gizzard used for grinding up food. Another feature not found in the human but found in a range of other animals is the crop. In birds this is found as a pouch alongside the esophagus. Other animals including amphibians, birds, reptiles, and egg-laying mammals have a major difference in their GI tract in that it ends in a cloaca and not an anus. Gastrointestinal tract The gastrointestinal tract (digestive tract, digestional
Evolution of reptiles steps towards reptiles, but the development of hard-shelled external eggs replacing the amphibious water bound eggs is the defining feature of the class Reptilia and is what allowed these amphibians to fully leave water. Another major difference from amphibians is the increased brain size, more specifically, the enlarged cerebrum and cerebellum. Although their brain size is small when compared to birds and mammals, these enhancements prove vital in hunting strategies of reptiles. The increased size of these two regions of the brain allowed for improved motor skills and an increase in sensory development. The origin of the reptiles lies about