Recombinant DNA and dewar flask: what they have in common

1. Step 1. Recombinant DNA — is used in — Genetically modified crops. Genetic engineering.
2. Step 2. Genetically modified crops — uses — Mineral fertilizer. Intensive farming combines varieties and fertilizers.
3. Step 3. Mineral fertilizer — is made of — Ammonia. Nitrogen fertilizers.
4. Step 4. Ammonia — is made of — Nitrogen. Nitrogen from the air.
5. Step 5. Nitrogen — is material for — Liquid nitrogen. Nitrogen.
6. Step 6. Liquid nitrogen — is used in — Dewar flask. Storage.

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