Yoke bows and watt steam engine: what they have in common

1. Step 1. Yoke bows — is part of — Yoke. Bows that go around the animals’ necks.
2. Step 2. Yoke — is used in — Plough. It was pulled by oxen in a yoke.
3. Step 3. Plough — evolved into — Steel plough. A steel share.
4. Step 4. Steel plough — is used in — Tractor. Ploughing with a tractor.
5. Step 5. Tractor — evolved from — Watt steam engine. The first tractors were steam-powered.

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