Boat and gyroscope: what they have in common

1. Step 1. Boat — evolved into — Sailing ship. Sailing ships grew out of rowing boats.
2. Step 2. Sailing ship — has part — Compass. A magnetic compass.
3. Step 3. Compass — evolved into — Gyrocompass. A compass without a magnet.
4. Step 4. Gyrocompass — has part — Gyroscope. A gyroscope.

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