Which answer gives both a positive impact and a negative impact that are associated with the effects of nitrogen- and phosphorus-enhanced fertilizers? increased algal blooms and damage to drinking water increased plant growth and damage to drinking water increase in denitrifying bacteria and increase in plant growth increase in a limiting resource and increase in denitrifying bacteria

The point which states that increased plant growth and damage to drinking water depicts both the negative as well as positive impact with regards to nitrogen- and phosphorus-enhanced fertilizers.

Explanation:

The farmers use nitrogen- and phosphorus-enhanced fertilizers to promote high growth in plants.

This combination of fertilizers facilitates development of plant in all aspects including root, stem, flower and fruits. This is considered as positive impact.  

On the other hand, these types of fertilizer are highly insoluble and remains in the farm soil are more period of time.

Due to sudden pour or wash off, these fertilizers are washed away from the field and is deposited in the drinking water which damages it and makes it unfit for drinking purpose. This is considered as negative impact.

c. establishing proper sleep hygiene