What Breed are these chicks?!?!
Profile photos in good lighting is best so we can see the full chick.
You may have:
Top Black Sex Link if no white on the chick.
Middle, may be an Easter Egger if green legs and a bit of muff
Bottom yellow, likely a White Rock or possible White Leghorn...might be a Cornish Cross (meat bird)...or even a Delaware...lots of chicks are yellow.