Organ transplantation and heat pump: what they have in common

1. Step 1. Organ transplantation — uses — Blood groups. Compatibility.
2. Step 2. Blood groups — is used in — Blood bank. Recording blood groups.
3. Step 3. Blood bank — uses — Refrigerator. Cold storage.
4. Step 4. Refrigerator — works like — Heat pump. A heat pump is a refrigerator that heats the house.

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