Question

what is the first form of chemical digestion that food meets as it enters the digestive system?
tearing by incisors
saliva in the mouth
chewing by molars
enzymes in the liver

Explanation:

Food enters the digestive system through the mouth. Saliva in the mouth contains enzymes like amylase which start the chemical - breakdown of carbohydrates in food. Tearing by incisors and chewing by molars are mechanical digestion. Enzymes in the liver act later in the digestive process.

Answer:

saliva in the mouth