(Question)
Answer the following question given this paragraph: Unsafe water supplies have drastic effects on human health. Waterborne diseases are diseases due to microscopic pathogens in fresh water. These diseases can be caused by protozoa, viruses, bacteria, and intestinal parasites. In many parts of the world there are no water treatment plants. If sewage or animal manure gets into a river, then people downstream will get sick when they drink the water. According to the World Health Organization (WHO), diarrheal disease is responsible for the deaths of 1.8 million people every year. It was estimated that 88% of the cases of diarrheal disease are caused by unsafe water supplies. Q: What type of contamination causes almost 90% of diarrheal disease worldwide? Choices: - air contamination - ground contamination - food contamination - water supply contamination A:
(Answer)
water supply contamination

(Question)
Answer the following question given this paragraph: Another example is carbon dioxide. This gas is produced from a variety of reactions, often by the burning of materials. The structure of the gas consists of one atom of carbon and two atoms of oxygen. Carbon dioxide production is of interest in many areas, from the amount we breather out to the amount of the gas produced by burning wood or fossil fuels. By knowing the exact composition of carbon dioxide, we can make predictions as to the effects of different chemical processes. Q: The structure of the gas carbon dioxide consists of one atom of carbon and two atoms of what? Choices: - sulfur - methane - Helium - oxygen A:
(Answer)
oxygen

(Question)
Answer the following question given this paragraph: Q: What is given off from plants and taken in by animals? Choices: - methane - sulfur - nitrogen - oxygen A:
(Answer)
oxygen