Answer:
They are 3 in numbers
Explanation:
which are the airway, the lungs, and the muscles of respiration
I think the answer is the individuals born per unit time.
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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