Trigger and needle: what they have in common

1. Step 1. Trigger — is part of — Crossbow. A trigger.
2. Step 2. Crossbow — evolved from — Bow and arrow. A bow on a stock.
3. Step 3. Bow and arrow — is made of — Flint. Arrowheads were knapped from flint.
4. Step 4. Flint — is material for — Stone tool. Tools were knapped from flint and other rocks with a sharp fracture.
5. Step 5. Stone tool — evolved into — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.

Open Evothings