The gupta empire is known as the first civilization to

use numbers

create an alphabet

set up a medical system

gain land through marriage

I think it is  number 3 set up a medical system. 

Towns and small farms are usually for land, lakes, rivers, and seas.they also produce other food, like crops.it's also where animals are, where we get our meat.large plantations normally have forests, where crops are grown for sale. (similar to farms)plantations have larger fields of crops.our wine, sugar canes, and fruits come from plantations.