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They have a yolk sack that you can't see, and it profides them with all the nutrients they need for about the first 72 hours, so you don't need to feed them or give them water while they're in the incubator.
Technically correct, but if all your chicks finish hatching and fluff up quite quickly, you don't need to leave them in the bator for the full 72 hours. As soon as they're fluffed up you can put them in their brooder box, which should be pre-warmed to the correct temperature for them and have a feeder and waterer in it. You feed them chick crumbs, which are tiny pellet crumbs that provide them with all the nutrients they need.