Answer:
II. Nitrates III. Phosphates
Step-by-step explanation:
An algal bloom resulting from excess detergent and fertilizer use in the surrounding community is most likely a result of Nitrates and phosphates.
The main constituent elements of a fertilizer include Nitrogen, Phosphorus and Potasssium.
Nitrates and phosphates are nitrogen and phosphate compounds respectively. The presence of the nitrates and phosphorus provide a source of food for algae and helps them and other aquatic plants to grow. This thereby depletes the oxygen content in water in a process called eutrophication
and pose a great risk to humans and animals.