Which sentence requires a comma between the adjectives?

“Weathered” and “cracked” both describe the door independently, so they are coordinate adjectives. You can join them with “and” (“the weathered and cracked door”) or reverse them (“the cracked, weathered door”), so a comma belongs between them: “The weathered, cracked door…” “Small young chipmunks” has a usual size-before-age order, so those adjectives are not separated by a comma.

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