Cartridge and hammer: what they have in common

1. Step 1. Cartridge — has part — Percussion cap. A primer in the case.
2. Step 2. Percussion cap — evolved from — Flintlock. The percussion lock replaced the flintlock.
3. Step 3. Flintlock — is made of — Flint. A flint strikes the spark.
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 — Hammer. The first hammer was a stone in the hand.

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