The effects of a potential pollutant were tested by adding it to a fish tank containing 100 fish, and comparing their survival to 100 fish of the same species and size in another tank filled with pure water. The treatment tank was selected at random. Based on such design of the experiment, why definite conclusions cannot be drawn from it?
A. Lack of appropriate controls.
B. Lack of replication.
C. Lack of randomization.
D. Lack of clear outcome measure. Sample material 2019/2020 II
E. Lack of controls and clear outcome measure.
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