Flexible silicone tube and petri dish: what they have in common

1. Step 1. Flexible silicone tube — is part of — Catheter. A channel for the liquid.
2. Step 2. Catheter — is part of — IV drip. A catheter.
3. Step 3. IV drip — has part — Syringe. A needle.
4. Step 4. Syringe — is used in — Vaccine. Injections.
5. Step 5. Vaccine — uses — Germ theory of disease. Pasteur developed vaccination on the basis of germ theory.
6. Step 6. Germ theory of disease — is used in — Petri dish. Growing bacterial cultures.

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