How does flooding rice fields reduce the need for herbicides and pesticides in rice farming? a. While rice has a submerged growth state, most weeds and pests do not.
b. Flooding the fields causes the soil to degrade so weeds cannot take root.
C. Residual herbicides and pesticides from previous seasons dissolve in the water.
d. All of the above

It’s D all of the above

a.  While rice has a submerged growth state, most weeds and pests do not.

Explanation:

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.