This question gives a scenario for an experiment where a scientist has attempted to support the hypothesis that the addition of phosphorus fertilizer increases the growth of single$-$celled algae $($a type of plant$)$ in lakes. For the scenario below, indicate whether or not you would accept the conclusions and why you would or would not accept them, using the following choices:

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Because the scientist has a limited budget to buy fertilizer, she fertilizes the $6$ smallest lakes in the area with phosphorus and measures the change in algae populations over time. Because the change in these lakes is significantly greater than the change in $6$ slightly larger control lakes, the scientist concludes that phosphorus has a significant effect on plant growth.

Group of answer choices

There is no control group.

There is no repetition$/$replication

There is no randomization of the subjects.

There are no issues with this experiment