the answer could be Henry Purcell
From what I remember, children in Sparta were pushed towards military. If a child was found to be weak, then they were left for dead. In Athens, they were pushed towards academics and arts. I think that's the main difference.
They need more food to keep fighting
Because if the answer is primary, it means it was written by a person living in that time period. Basically, it makes it more credible because that author was living during the time period so knows it without it being distorted or changed.
