Water tower et petri dish : ce qu'ils ont en commun

1. Étape 1. Water tower — fait partie de — Plumbing. Maintaining pressure.
2. Étape 2. Plumbing — fonctionne comme — Aqueduc. An aqueduct brings water to a city, plumbing distributes it inside; Minoan pipes are older than the Roman aqueducts.
3. Étape 3. Aqueduc — fonctionne comme — Sewerage. Both systems carry water by gravity through channels: one drains waste, the other supplies water; the drains of Mohenjo-daro are older than the Roman aqueducts.
4. Étape 4. Sewerage — a pour partie — Sewage treatment plant. Treatment plants.
5. Étape 5. Sewage treatment plant — utilise — Culture medium (agar). Waste water is cleaned by activated sludge — bacteria.
6. Étape 6. Culture medium (agar) — utilise — Petri dish. Agar in dishes.

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