Flaps and greenhouse: what they have in common

1. Step 1. Flaps — is part of — Wing. High-lift devices.
2. Step 2. Wing — is part of — Seaplane. An aeroplane with wings.
3. Step 3. Seaplane — has part — Propeller. A propeller.
4. Step 4. Propeller — evolved from — Archimedes’ screw. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.
5. Step 5. Archimedes’ screw — is used in — Irrigation. The Archimedes’ screw lifted water for irrigation.
6. Step 6. Irrigation — is used in — Greenhouse. Watering plants.

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