Question

Which of the following matches a human action with its impact? Construction of bridges : Water pollution Construction of dams : Decrease in carbon dioxide level Use of fertilizers : Increase in population of aquatic plants Decrease in honeybee population : Increase in plant population

Answer 1

Use of fertilizers: Increase in population of aquatic plants

Step-by-step explanation:

The human activities have had very big effect on the environment. One of those effects is the eutrophication. The eutrophication is a process that occurs because of usage of the fertilizers. The fertilizers manage to wash through the soil, get to the waters, and thus significantly enrich them with nutrients. This results in an explosion in the number of aquatic plants, as the water has much higher nutritional base. While this is good for the plants, it is devastating for the marine fauna, as the plants start to block the sunlight, change the gas composition of the gases in the water, and the end result is mass dying out of the fauna.

Answer 2

Construction of bridges: water pollution

Step-by-step explanation:

Construction of bridges carries out with it the runoff of the sediments that are carried to the water under it, moreover, the rubber materials and other metals deposited on the tires of vehicles moving on the bridge and fuels draining from them, all are passed into the underlying water that result in increase in the water pollution.