Magnifying glass and truck: what they have in common

1. Step 1. Magnifying glass — has part — Lens. A converging lens.
2. Step 2. Lens — is part of — Smartphone camera. A lens of several elements focuses the image.
3. Step 3. Smartphone camera — is part of — Quadcopter (drone). A camera.
4. Step 4. Quadcopter (drone) — has part — Propeller. Air propellers.
5. Step 5. Propeller — is part of — Amphibious vehicle. A propeller.
6. Step 6. Amphibious vehicle — evolved from — Truck. A truck chassis.

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