Based on the evidence shown in the graph, which of these changes is MOST LIKELY to have occurred on farms in the United States during the same time period?
A decreased use of herbicides on soybean fields

B. decreased nutritional value of the average ear of corn

C. decreased value of the total soybean crop

D
decreased concentrations of weeds on cotton fields

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?