African elephants flap their large ears to cool off. which biology theme does this phenomenon represent?

This phenomenon represents homeostasis. It is a self regulating process used by biological systems to maintain stability while adjusting to conditions that are optimal for survival. If it is successful, life will continue.

In this example the African elephants flap their large ears in the air to help cool the blood that flows through them.

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supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes