<span>a)Stem cells must always be provided by a donor who is financially compensated.</span>
Answer:
Pretty sure it's A because people can redo this test as many times as needed to verify the answer.
Her conclusion is invalid because using sand instead of soil slows down plant growth. Fertilizer, on its own, does not 'greatly' increase the size of the plant.
The correct way to do this experiment would be to keep all other parameters same, except the fertilizer. This will give her accurate results.
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