Question

algal blooms occur due to the presence of an excess amount of nutrients, like phosphorus, in fresh water. how does excess phosphorus get into fresh water? the nutrients leak into fresh water from oil refineries in the vicinity the nutrients are formed by the decomposition of organic wastes dumped into freshwater the nutrients are a part of the fertilizers that are often washed away into ponds. the nutrients are added to the water by fisherman to feed the fish

Explanation:

Algal blooms are caused by excess nutrients in fresh - water. Fertilizers containing phosphorus are often washed away into ponds from agricultural or gardening activities. Decomposition of organic wastes can also release nutrients into water. Oil refineries do not typically directly contribute nutrients for algal blooms in this context, and adding nutrients by fishermen to feed fish is not a common source of excess phosphorus for widespread algal blooms.

Answer:

The nutrients are a part of the fertilizers that are often washed away into ponds.