These animals have an internal skeleton with a vertebral column allowing different muscle attachment points for movement. They are cold-blooded, have scales, breathe through lungs, and most have a three-chambered heart. They differ from fish in lacking scales, having mucus glands in their skin, and a three-chambered heart. They respire through gills or lungs and lay eggs. Warm-blooded animals have a four-chambered heart, lay eggs, have feathers, and modified forelimbs for flight. They breathe through lungs.
3. These animals have a true vertibral column and internal
skeleton. Allowing a completely different distribution
of muscle attachment points to used for movement.
4. These animals are cold blooded animals,have scales and
breathe through lungs.While most of the animals have
a three chambered heart .
5. These animals are the differ from the fish in the lack of
scxales , in having the mucus gland in the skin and a
three chambered heart.Respiration is through either
gills or lungs .They lay eggs
6. These are the warm blooded animals
and have a four chambered heart. They
lay eggs .There is an outside covering
of feathers,and two forelimbs are
modifing for flight.They breathe
through lungs.
