Animal waste, oil and urea are some of the organic impurities present in sewage. Name two more organic impurities present in sewage.

How are open drains harmful for human health?

Name two inorganic impurities present in sewage.

Name two alternative arrangements for sewage disposal where there is no sewerage system.

A man traveling in a train threw an empty packet of food on the platform. Do you think this is a proper waste disposal method? Elaborate.