Answer :
Answer:
The answer is cow pasture.
Explanation: When the dead cow pasture decomposes, it releases phosphates into the environment. In addition, the cows that feed on the pasture release manure with phosphates content. When the phosphates reach the pond, they spur up bacteria and algal growth in the pond causing an algal bloom. This results in taking up of dissolved oxygen (for cellular respiration) until the waters become anoxic.