Whistle and centrifugal pump: what they have in common

1. Step 1. Whistle — is part of — Whistling kettle. A whistle.
2. Step 2. Whistling kettle — is a kind of — Kettle. A kettle.
3. Step 3. Kettle — evolved into — Electric kettle. A kettle with a heater.
4. Step 4. Electric kettle — has part — Heating element. A heating element in the base heats the water.
5. Step 5. Heating element — is part of — Dishwasher. Heating the water.
6. Step 6. Dishwasher — has part — Centrifugal pump. A pump feeds water to the spray arms.

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