Carriage and stone tool: what they have in common

1. Step 1. Carriage — evolved into — Stagecoach. A public coach.
2. Step 2. Stagecoach — uses — Horse collar. It is pulled by horses.
3. Step 3. Horse collar — is used in — Plough. The horse collar made ploughing with horses possible.
4. Step 4. Plough — evolved from — Hoe. The plough mechanized loosening the soil with a hoe.
5. Step 5. Hoe — evolved from — Stone tool. Neolithic hoes of stone and antler.

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