PLS HELLP THIS IS A TEST GRADE AND I CAN'T FAIL 20 POINT What was one reason why the area where Mesopotamia was created is called the Fertile Crescent

A. Surrounding deserts made trade difficult.
B. seasonal flooding created rich soil
C. harsh winters made farming difficult.
D. Large mountains protected the area from storms

Aresearcher is studying women recently admitted to a state prison. all potential subjects must have children under the age of five. research subjects will be given a basket of toys to use at their children’s first visit that the children can then take home. in assessing this proposal, the irb needs to determine that the toys are: age appropriate.not an excessive incentive.educational.of high quality.