Write a letter to your brother telling him about the importance and benefits of cooperative

Letter in explanation.

Explanation:

Hey brother, It's me your brother, I just wanted to right a letter to you but I was afraid if you may dislike it. I love very much and I just want to say that please be cooperative with your loved ones.

the correct labels are as follows:

a: yellow river

b: himalayan mountains

c: north china plain

d: taklimakan desert

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place