Question

Hi, can someone help, please? I'm offering 78pts and brainliest.

Answer 1

Answer: Option B.

Increased fertility of the land downstream.

Explanation:

Dam refers to structures built that serve as a barrier for water outflow and retain water. Dams trap sediments,gravels, logs, rock river beds where fishes spawn. It is expensive to construct dams. Dams construction normally lead to extinction of aquatic animals from their habitats and it can lead to flooding. When this occur, there will be nutrient depletion . Aquatic lives can be a source of nutrients and when there is extinction the land will be infertile

Answer 2

Answer:

B. Increased fertility of the land downstream

Explanation:

Dams are constructed across river to prevent water flow they conserve water for human use.

It has both advantages and disadvantages.

Dam are expensive to construct

Dam are used in generating hydropower, for supply of water for domestic use, irrigation,industrial use.

Dams detract from natural settings, ruin nature’s work

Dams leads to extinction of natural habitat, It could result in flood due to over flow, it leads to migration of people out of there homes due to it construction. Construction of dam is unlikely to increase fertility downstream.