Headphones and plough: what they have in common

1. Step 1. Headphones — has part — Headband. A band that presses the cups.
2. Step 2. Headband — is part of — Bit and bridle. Straps on the head.
3. Step 3. Bit and bridle — is used in — Chariot. Controlling the horses.
4. Step 4. Chariot — evolved from — Cart. A chariot is a lightened cart.
5. Step 5. Cart — uses — Horse collar. The horse collar let horses pull heavy carts.
6. Step 6. Horse collar — is used in — Plough. The horse collar made ploughing with horses possible.

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