Culture medium (agar) and aerosol can: what they have in common

1. Step 1. Culture medium (agar) — is used in — Sewage treatment plant. Waste water is cleaned by activated sludge — bacteria.
2. Step 2. Sewage treatment plant — is part of — Sewerage. Treatment plants.
3. Step 3. Sewerage — is used in — Flush toilet. Draining the waste.
4. Step 4. Flush toilet — has part — Valve. The cistern’s float valve.
5. Step 5. Valve — is part of — Aerosol can. A valve.

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