Classroom Chicks! Help me figure out the breeds!

[ChickensAndCoffee]

Hi! We have 7 classroom-hatched chicks that came home with us recently. I was wondering if anyone had any clues as to what the yellow chick and black chick are at least? We have mostly black ones.

Not sure where the hatching eggs came from.

Thanks for any help!

 

[SilverBirds]

They are most likely mixed breeds.