Things are often shaped to make less drag. That's called streamlining. For example, a truck with a flat front will experience high air resistance while a sports car with a curved shape will experience lower air resistance, allowing the car to go faster; because the air has less surface area to push against and therefore moves more smoothly across it. This is why airplanes and other fast machines are streamlined, and the same is true of fish. A snowflake falls more slowly than does a drop of water of the same weight.
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