The diagram below shows the effect of polluting a river with untreated whey. What does graph \( ...

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The diagram below shows the effect of polluting a river with untreated whey. What does graph \( \mathrm{X} \) represent ?
(1) Bactetial count
(2) Number of Zooplanktons
(3) Mass of curds
(4) Concentration of rennet
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