Question

conserving the quality of available water is a high priority worldwide. there are many countries whose water supply is reaching dangerous levels of contamination. for example, the longest river in china, the yangtze, is less than 5 years from death if nothing changes. the statements below are possible effects on the environment if the yangtze dies. which one is a positive effect on the environment?
a the loss of biodiversity in the area could permanently damage the ecosystems in area.
b loss of this river could stress the other water supplies in surrounding areas causing a domino effect.
c the yangtze empties into the sea of shanghai, which may lead to serious problems in this important body of water.
d since the pollution in the water is high in organic material, it will eventually decompose and make the area more fertile.

Explanation:

Options A, B, and C describe negative environmental impacts: permanent ecosystem damage from biodiversity loss, stress on other water supplies, and harm to coastal waters. Option D describes a positive outcome where organic pollution decomposes to increase soil fertility.

Answer:

D. Since the pollution in the water is high in organic material, it will eventually decompose and make the area more fertile.