Final answer:
White Plymouth Rock chickens lay brown eggs due to their breed, influenced by the diet for yolk color variation.
Explanation:
White Plymouth Rock chickens typically produce brown eggs. The color of the eggshell is determined by the breed of the hen, with this specific breed known for laying brown eggs. The yolk color, on the other hand, is influenced by the hen's diet. Therefore, White Plymouth Rock chickens lay eggs with brown shells and yolks that can vary in color.
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