Scientists determined that excess fertilizer from farms entered a shallow lake. the fertilizer caused an increase in aquatic plants
in the lake and then a decrease in oxygen in
the water. next, organic debris collected on
the bottom of the lake. over several years,
the lake gradually filled in with organic sediment. as the fertilizer levels increased, the population of consumers in the lake
declined. which change most likely caused this decline?
a. increase in light intensity
b. decrease in available oxygen
c. increase in temperature
d. decrease in carbon dioxide