Which of the following have improved farming practices and crop production? select all that apply.

sophisticated irrigation

chemical fertilizers

chemical pesticides

increased number of farmers

I think sophisticated irrigation and increased number of farmers because we'll I'm a go back to Mesopotamia because if the didn't find ways to make silt they would be like dead of starvation because none of their crops would grow also having a increased number of framers helps but u always say this to make sure no one has a bad grade because of me research before you put this in just in case

sophisticated irrigation, chemical fertilizers, chemical pesticides

Explanation:

The use of irrigation to provide needed water and the use of natural fertilizers to promote crop growth are farming methods that have been practiced for centuries. More sophisticated irrigation techniques, various chemical pesticides, and modern chemical fertilizers have been developed in the twentieth century.

buildings sir and respect

permafrost layer, it exists beneath a layer of soil, rock or sediment.