Match head and petri dish: what they have in common

1. Step 1. Match head — is part of — Match. Potassium chlorate and sulfur.
2. Step 2. Match — evolved from — Fire making. A convenient way to make fire.
3. Step 3. Fire making — is used in — Pottery. The first pottery was fired right in a campfire.
4. Step 4. Pottery — evolved into — Saucepan. The first pots were ceramic.
5. Step 5. Saucepan — has part — Pot lid. A cap.
6. Step 6. Pot lid — is part of — Petri dish. A cap.

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