Question 9
agricultural runoff is polluting the chang jiang in china. what effect does the flow of large amounts of fertilizer and sewage have on the river?
a
it encourages germs to grow in the river, causing people and animals that drink the river water to become sick.

b
it causes large plants to grow thickly along the shore of the river, preventing animals and people from accessing the river.

c
it settles on the river bottom in thick, sludgy layers, making the river too shallow for commercial and recreational boats to navigate.

d
it causes algae and plants to grow and cover the surface of the water, blocking sunlight and killing plants and animals that live underneath.