9. Why it may not safe to drink water straight from a river? Fresh water from these sources contain: A. small insoluble particles such as grit and silt B. soluble substances, including salts, pesticides and fertilizers C. bacteria and other microorganisms that may be harmful to health D. bacteria and other microorganisms may be helpful to the health of human
Water in a stream, river or lake may look clean, but it can still be filled with bacteria, viruses, and parasites that can result in waterborne diseases, such as cryptosporidiosis or giardiasis.
