Physics
Mud houses are cooler in summers and warmer in winters as compared to brick houses because

Mud is a bad conductor
Mud is a good conductor
Evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters
Mud is a poor insulator

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Physics
The law of conservation of energy states that

Energy can either be created or destroyed
Energy can neither be created or destroyed
Energy can neither be created nor destroyed
Energy can either be created nor destroyed

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