Answer:
Human activities are the main cause of pollution.
Step-by-step explanation:
Human activities such as burning of fossil fuels, use of methane gas for cooking and smoke & waste materials produced by industries etc are the main causes of pollution. Due to this pollution different types of diseases are occurs to human body as well as other animals and the ecosystem is also adversely affected. The polluted water goes to the sea and oceans and adversely affected the life of marine animals.