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.
Answer: Un evento histórico que ha afectado profundamente al carácter de mi comunidad fue el evento de 9/11. Este evento alerto el pais, y hico que fuernanos un pais con mas protección y seguridad. Por ejemplo, en los aeropuertos, en espacios publicos y etc.
