Question: Answer the following question given this paragraph:   Chemical digestion could not take place without the help of digestive enzymes and other substances secreted into the GI tract. An enzyme is a protein that speeds up a biochemical reaction. Digestive enzymes speed up the reactions of chemical digestion. Table below lists a few digestive enzymes, the organs that produce them, and their functions in digestion.   Q: What speeds up the reactions of chemical digestion?   A:
Answer: digestive enzymes

Question: Answer the following question given this paragraph:   Toxic heavy metals include mercury and lead. Mercury is used in some industrial processes. It is also found in fluorescent light bulbs. Lead was once widely used in gasoline, paint, and pipes. It is still found in some products.   Q: Mercury and lead, which was once widely used in paint and gasoline, are examples of what type of metals?   A:
Answer: toxic heavy metals

Question: Answer the following question given this paragraph:   Courtesy of the CDC/Debora Cartagena. Cigarettes are a major source of chemical carcinogens .   Q: Cigarettes are a major source of what kind of chemical substances linked with cancer?   A:
Answer: