What part of the digestive system first causes chemical changes to food? A. teeth in the mouth
B. saliva in the mouth
C. enzymes in the stomach
D. enzymes in the small intestine

b. saliva in the mouth

Explanation:

saliva contains enzymes that help break down food

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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