Sled runners and stone tool: what they have in common

1. Step 1. Sled runners — is part of — Sledge. They glide over the snow.
2. Step 2. Sledge — evolved into — Cart. The wheeled cart replaced drag sledges and sleds.
3. Step 3. Cart — uses — Horse collar. The horse collar let horses pull heavy carts.
4. Step 4. Horse collar — is used in — Plough. The horse collar made ploughing with horses possible.
5. Step 5. Plough — evolved from — Hoe. The plough mechanized loosening the soil with a hoe.
6. Step 6. Hoe — evolved from — Stone tool. Neolithic hoes of stone and antler.

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