Eutrophication can lead to decreased dissolved oxygen in a body of water. this often results in a. the deaths of all plant and marine life in the area b. an increase in water pollution in the area c. more biodiversity in the area d. less air pollution in the area

Option (A)

Explanation:

Eutrophication usually refers to the condition when there are excessive nutrients present in the water body. These nutrients are frequently accumulated in the water body from the flowing down of materials from the land areas. This leads to the decreasing amount of dissolved oxygen in the water as a result of which the lives existing in the water body such as the aquatic plants and marine animals find difficult to survive and thereby leads to their deaths.

Thus, the correct answer is option (A).

a. european colonies