. Why do scientists measure levels of dissolved oxygen in water?
A. to predict erosion of a riverbed
B. to predict floods and droughts
C. to analyze point-source water pollution
D. to analyze water quality
D. to analyze water quality
Measuring levels of dissolved oxygen in water is important for assessing the overall health of an aquatic ecosystem. Low levels of dissolved oxygen can indicate pollution, excessive nutrient levels, or other factors that may harm aquatic organisms. Monitoring dissolved oxygen levels helps scientists gauge the water quality and determine if any actions are needed to protect the ecosystem.