The following question(s) relate to the data table below, showing typical fluctuating pH and dissolved oxygen levels in a fish pond with a heavy concentration of algae over a 24-hour period.

-What is a possible reason for oxygen to be so low by the end of the night?

Question

The following question(s) relate to the data table below, showing typical fluctuating pH and dissolved oxygen levels in a fish pond with a heavy concentration of algae over a 24-hour period.
 
-What is a possible reason for oxygen to be so low by the end of the night?

Quizplus · Accepted Answer

Algae produce oxygen during the day through photosynthesis, but not at night. Meanwhile, fish and other organisms continue to consume oxygen throughout the night, leading to lower oxygen levels by dawn.

The Following Question(s) Relate to the Data Table Below, Showing