1. A forest is cut down in your neighbourhood to make room for a new shopping mall.
2. Pollution from a factory is washed into the river.
3. A volcano erupts.
4. Warm ocean tides causes certain algae to grow rapidly. This algae is deadly to fish.
5. Farmers use Fertilizers to keep bugs off of their crops.

a. Dead fish are found washed up on the beaches
b. Animals who have made their homes in forest eitheir die off or moveto another area
c. The Fertilizers are washed off the crops and into the local waterways,harming fish
d. Lava pours out and hardens to cover the land in igneous rock. Native species of plants are destroyed
e. The pollution of organisms in the river will decrease (go down) over time​