A science research group is testing a new type of plant food. One trial is conducted in a controlled experiment. The data from the trial show that the plant that received the new food grew faster than the control plant. The group announces that the new plant food makes plants grow faster. What is the main weakness in this scientific claim?
Answer
A
The claim is not based on a controlled experiment.
B
The claim is not based on data.
C
The claim is not made by scientific researchers.
D
The claim is not based on evidence from multiple trials.
Explanation
The trial was controlled and produced data showing that the treated plant grew faster, so choices A and B do not describe the weakness. However, a result from just one trial may be due to chance or an unusual condition. Repeating the experiment in multiple trials would provide stronger evidence that the new food reliably makes plants grow faster.
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