Biology · May / June 2023 · Paper 22 · Question 4
5090
As printed in the paper
The question as text
Lake Washington in the United States of America is a large fresh water lake. Between 1941 and 1963 an increasing amount of untreated sewage polluted the lake.
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Show the answer and mark scheme
4(a)[5]
4(b)[2]
4(c)(i)[4]
4(c)(ii)[5]
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