Companies use to know whether or not a region is growing enough to sustain new business. A.
historical maps
B.
population trend information
C.
current news articles
D.
opinion poll results

It's considered to be association or connection

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.

Smelly rocks sink in water haha!