Why do many crops grow in California's Central Valley?

population
soil
workers
climate

answer; did not understand that the act was wrong because she/he was suffering from a mental illness;

answer; transportation, store's,a whole lot more of ugly people,ect

the secretary of defense is the principal defense policy advisor to the president. under the direction of the president, the secretary exercises authority, direction, and control over the department of defense.

as you did not provide any choices for me to choose from to give you a direct answer, this is the only information i can provide.