Eutrophication is caused by a. an increase in nutrients b. a decrease in nutrients c. the introduction of new species of animals d. the introduction of new species of plants

a. an increase in nutrients

Explanation:

Eutrophication is caused by an increase in nutrients.

Option A

Explanation:

Eutrophication can be defined as a phenomenon which takes place due to excess of nutrient in the water bodies.

The agricultural runoff that travels from the agricultural fields to the nearby  water bodies. These run off contains nitrogen and potassium which increases the growth of algal bloom in water.

This algal bloom covers the water surface and decreases the oxygen concentration in the water and kills the aquatic animals found in water.

Hence, the correct answer is option A

the correct answer is: d. the saltine and pretzel are made of flour, yeast, and baking soda, and salt. the pecan contains no flour but it does contain fats. the pecan is a nut that can be consumed as a healthy snack. first of all, pecans are a source of fat (monounsaturated fat), but they provide less fat than some other nuts. pecans are a rich source of dietary fiber, manganese magnesium, phosphorus, thiamin, vitamin e…