Can anyone help

[babygirl88]

Hello everyone, my son brought some seeds home from school and can't remember what it was but we planted one of them anyway and it has sprouted, it looks like some form of a tree and hopefully someone can give us a better idea then google has shown us
Photo attached
Thanks

 

[cpp gardener]

It looks like trifoliate orange, used for rootstock, or Carrotwood Tree, also called Tuckeroo or Beach Tamarind. If you pinch a leaflet and it smells 'citrus-y' it's probably the orange.