The enzymes that break down starch into simple sugars is called amylase. Amylase can be located in the salivary glands, pancreas and the small intestine. The enzymes act as a catalyst and speeds up the breakdown of the starch.
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Decomposers are necessary in the food chain because they return nutrients to the ecosystem (2)
It could form an ionic bond with Fluorine or Chlorine. (There are many others that it could as well but those are the most basic)
How does the whole question go?