Which posed the greatest challenge to pioneers crossing the western mountains?

Lack of water. hot desert sand. o steep and Langerous passes.

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.

Ibelieve it is