Casting and petri dish: what they have in common

1. Step 1. Casting — is used in — Bronze. Bronze objects were cast in moulds.
2. Step 2. Bronze — is material for — Saucepan. Ancient cauldrons were bronze and copper.
3. Step 3. Saucepan — has part — Pot lid. A cap.
4. Step 4. Pot lid — is part of — Petri dish. A cap.

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