Which phase of digestion is most likely disrupted if a person lacks the ability to produce specific enzymes?

Name: Which phase of digestion is most likely disrupted if a person lacks the ability to produce specific enzymes?
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Question

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Chemical digestion requires enzymes,the protein molecules that speed a reaction at body temperature.Enzymes are secreted by the digestive tract itself or by accessory glands that send their juices into the tract by way of ducts.Enzymes are specific and usually work in small steps.

Which Phase of Digestion Is Most Likely Disrupted If a Person