Streptomycin and sewage treatment plant: what they have in common

1. Step 1. Streptomycin — is a kind of — Antibiotic. An antibiotic.
2. Step 2. Antibiotic — uses — Fermentation. Penicillin is produced by fermentation.
3. Step 3. Fermentation — is used in — Sewage treatment plant. Activated sludge is microbes.

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