Read the sentence. Digestion is divided into four parts, ingestion, digestion, absorption, and elimination. Which revision is necessary?

The words “Digestion is divided into four parts” form a complete statement, and the four items that follow explain what those parts are. A colon should introduce the list, so change the comma after “parts” to a colon. The revised sentence reads: “Digestion is divided into four parts: ingestion, digestion, absorption, and elimination.”

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