What breed and genders are these?

[Juliesmith4]

My 2nd grader hatched these at school. We inherited them. They are 2(ish) months old. Any ideas on breed or gender? There are 5 total.

 

[SarahBC]

The black one with the brown flecks on the chest looks like my black copper marans but I am new to chickens so don't know much! lol

 

[Leahs Coop]

View attachment 1816769 View attachment 1816748 View attachment 1816751View attachment 1816753 View attachment 1816756 View attachment 1816746 My 2nd grader hatched these at school. We inherited them. They are 2(ish) months old. Any ideas on breed or gender? There are 5 total.

Picture #2 Delaware Cockerel
Picture #3 Black Sexlink Pullet
Picture #4 Buff Orpington cross, cockerel
Picture #5 Welsummer cockerel
Picture #6 Looks like a White Leghorn pullet, but if the earlobes are red then she's a White Plymouth Rock.

 

[Juliesmith4]

Picture #2 Delaware Cockerel
Picture #3 Black Sexlink Pullet
Picture #4 Buff Orpington cross, cockerel
Picture #5 Welsummer cockerel
Picture #6 Looks like a White Leghorn pullet, but if the earlobes are red then she's a White Plymouth Rock.

You are amazing! Thank you!

 

[Leahs Coop]

You are amazing! Thank you!

You're very welcome!

 

[Rosebudseast]

I am relatively new to chickens and we added this one into our flock being told it was a female Sexlink but its been acting strange: more aggressive, strutting, what looks like mounting the back of the others. Could it be a rooster?

 

[Frazzemrat1]

Picture #2 Delaware Cockerel
Picture #3 Black Sexlink Pullet
Picture #4 Buff Orpington cross, cockerel
Picture #5 Welsummer cockerel
Picture #6 Looks like a White Leghorn pullet, but if the earlobes are red then she's a White Plymouth Rock.

What she said... Completely

I am relatively new to chickens and we added this one into our flock being told it was a female Sexlink but its been acting strange: more aggressive, strutting, what looks like mounting the back of the others. Could it be a rooster?

That's a cockerel, no doubts.
And since its older than 12 weeks, this pic below is applicable. OP, this pic isn't applicable to your chickens yet, as they're not old enough to have the male vs female saddle feathers. They will soon though.

 

[Brandmar]

We have three chicks that were suppose to be guineas, but are definitely not. They started out looking exactly like guinea Keets, but at about three weeks old, they began looking different. After searching through countless photos trying to identify what they might be, we are at a total loss. Does anyone have any idea of what these might be? Thank you in advance.

 

[Frazzemrat1]

We have three chicks that were suppose to be guineas, but are definitely not. They started out looking exactly like guinea Keets, but at about three weeks old, they began looking different. After searching through countless photos trying to identify what they might be, we are at a total loss. Does anyone have any idea of what these might be? Thank you in advance.

American Game maybe

 

[Wezdin]

We have three chicks that were suppose to be guineas, but are definitely not. They started out looking exactly like guinea Keets, but at about three weeks old, they began looking different. After searching through countless photos trying to identify what they might be, we are at a total loss. Does anyone have any idea of what these might be? Thank you in advance.

I would say they are chickens, but further than that