Truck and radio: what they have in common

1. Step 1. Truck — evolved into — Ambulance. A special-purpose vehicle.
2. Step 2. Ambulance — has part — Defibrillator. A defibrillator.
3. Step 3. Defibrillator — has part — Capacitor. The energy of the shock is stored in a capacitor.
4. Step 4. Capacitor — is part of — Oscillator. An LC circuit.
5. Step 5. Oscillator — is part of — Radio. A carrier frequency oscillator.

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