Motorcycle e knife: o que têm em comum

1. Passo 1. Motorcycle — tem como parte — Roller chain. Many motorcycles drive the rear wheel with a roller chain.
2. Passo 2. Roller chain — faz parte de — Colheitadeira. Chain drives power the working parts.
3. Passo 3. Colheitadeira — evoluiu de — Sickle. The machine replaced reaping by hand.
4. Passo 4. Sickle — evoluiu de — Stone tool. The first sickles had flint inserts.
5. Passo 5. Stone tool — evoluiu para — Knife. The first knives were stone flakes.

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