Polyethylene and sickle: what they have in common

1. Step 1. Polyethylene — is made of — Crude oil. Made from petroleum products.
2. Step 2. Crude oil — is used in — Tanker. It carries oil.
3. Step 3. Tanker — has part — Diesel engine. A diesel.
4. Step 4. Diesel engine — is part of — Combine harvester. Self-propelled combines run on diesels.
5. Step 5. Combine harvester — evolved from — Sickle. The machine replaced reaping by hand.

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