Answer:1) deforestation, urbanization,bush burning
2)washing of chemicals into water bodies can lead to eutrophication
Explanation:humans activities such as deforestation , urbanization,bush burning etc,can cause the natural habitat to be depleted.
Runny water from agricultural lands usually washes off chemicals such as pesticides and herbicides and fertilizers into the water bodies.this leads to eutrophication.in eutrophication,excess algae grow on water bodies there by using up much oxygen and causing reduction in dissolved oxygen needed for breathing by other aquatic life.this can cause death in the animals and as they decay the water is polluted more.