Paper bag side gussets and diesel engine: what they have in common

1. Step 1. Paper bag side gussets — is part of — Paper bag. They let the bag fold flat.
2. Step 2. Paper bag — evolved into — Plastic bag. A replacement for paper.
3. Step 3. Plastic bag — is made of — Polyethylene. Polyethylene.
4. Step 4. Polyethylene — is made of — Crude oil. Made from petroleum products.
5. Step 5. Crude oil — is used in — Tanker. It carries oil.
6. Step 6. Tanker — has part — Diesel engine. A diesel.

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