A student studying the phosphate runoff into the Chattahoochee River basin near Atlanta, Georgia, developed the following model to show the impact of the mandatory restrictions that were put in place during 1995 to limit the runoff.

Which factors most likely contributed to the trends in phosphate runoff before the restrictions were implemented? Select two options.

Responses:

Increases in new of plant growth in the wetlands around the river

Weathering events happening on surrounding mountains

The application of fertilizer resulting in agricultural runoff

An increase in the number of animals eating plants

Uplifting of rock masses from recent earthquakes