These are the city's mechanics and builders. They take raw materials (like the food you eat) and speed up chemical reactions that would otherwise take years to happen on their own.
In a lab setting, biochemistry shifts from "what happens" to "how we know it happens." practical biochemistry
Every truck and crane in the city needs gas. In your body, that gas is ATP , the universal energy currency generated from the sugar in your diet. Practical Application: The Case of "Milk to Medicine" These are the city's mechanics and builders