Which clouds are common in winter at high altitudes and usually indicate cold but fair weather

Cirrocumulus clouds

Explanation: Cirrocumulus clouds are usually seen in the winter and indicate fair, but cold weather. In tropical regions, they may indicate an approaching hurricane. Altostratus clouds are gray or blue-gray mid level clouds composed of ice crystals and water droplets.

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the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.