Answer to question 3(a) can be hewch yned Word limit 300 words (max) 3(a) The investigation of a major outbreak of cholera in London during the 19th Century by Dr John Snow was an historical landmark in the development of public and environmental health. With reference to this investigation: How did Dr Snow trace the source of the outbreak and what was the most significant conclusion of his study with regard to public health? Answer to question 3(b) can be hand whether typed. Word Limit 500 words (max) (b) Water and wastewater treatment are barriers that break the source - pathway receptor process to protect public health. Using a maximum of two case studies where public health has been compromised through the provision of contaminated drinking water describe how barriers/treatment processes have either failed or been bypassed and the associated impacts on public health. Answer to question 3(c) can be hand-written or typed. Word Limit 300 words (max) (c) Which aquatic ecosystems are most vulnerable to acid rain? Explain why. Answer to question 3(a) can be hewch yned Word limit 300 words (max) 3(a) The investigation of a major outbreak of cholera in London during the 19th Century by Dr John Snow was an historical landmark in the development of public and environmental health. With reference to this investigation: How did Dr Snow trace the source of the outbreak and what was the most significant conclusion of his study with regard to public health? Answer to question 3(b) can be hand whether typed. Word Limit 500 words (max) (b) Water and wastewater treatment are barriers that break the source - pathway receptor process to protect public health. Using a maximum of two case studies where public health has been compromised through the provision of contaminated drinking water describe how barriers/treatment processes have either failed or been bypassed and the associated impacts on public health. Answer to question 3(c) can be hand-written or typed. Word Limit 300 words (max) (c) Which aquatic ecosystems are most vulnerable to acid rain? Explain why