4 A 3 S 2 Distance downstream from the point of entry of sewage (m) 0 ( 100 200 300 400 500 600 700 800 900 1000 3.1 3.2 3.3. 3.4 34 Number (arbitrary units) Bacteria Algae Fish C 88 79 20 6 1 0 51 0 48 0 44 83 0 42 90 0 39 84 0 36 68 4 35 55 20 Explain why the number of bacteria was the highest at 0 metres. Draw a line graph of the number of bacteria found at specific distances downstream from the sewage outflow. 20 8 73 60 7 21 40 70 Draw a conclusion regarding sewage pollution and the number of bacteria found in the water. Indicate the health concerns for human consumption regarding sewage in irrigation water. Read the article on dams in South Africa and answer the questions. € (5) (3) (3) [12] State to 15 Ruigte Val a 100km B The dams started in the same
