Spindle and truck: what they have in common

1. Step 1. Spindle — evolved into — Spinning wheel. A wheel turns the spindle.
2. Step 2. Spinning wheel — has part — Belt drive. The wheel is linked to the spindle by a cord.
3. Step 3. Belt drive — is part of — Combine harvester. Belt drives.
4. Step 4. Combine harvester — has part — Diesel engine. Self-propelled combines run on diesels.
5. Step 5. Diesel engine — is part of — Truck. A diesel engine.

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