Which statements describe the decline of sumer(more than one answer) a. there was a lack of natural barriers that could discourage attack b. the swamps bred insects that carried disease c. the needed canals became too costly to build d. as the fields of sumer grew saltier; harvest became smaller

Both B and D would work for this question but I would choose D

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.