Toothbrush and petri dish: what they have in common

1. Step 1. Toothbrush — is made of — Bone. Addis’s toothbrush has a bone handle.
2. Step 2. Bone — is material for — Whistle. Ancient whistles were carved from bone.
3. Step 3. Whistle — is part of — Whistling kettle. A whistle.
4. Step 4. Whistling kettle — is a kind of — Kettle. A kettle.
5. Step 5. Kettle — has part — Pot lid. A cap.
6. Step 6. Pot lid — is part of — Petri dish. A cap.

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