How is food broken down in the digestive system both physically and chemically

digestion starts in the mouth the food is grinded by action of teeth and this is called physical digestion the food is swallowed and act by enzymes such as salivary amylase which contain salivar and this is called chemical digestion because it involve the action of enzymes

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands