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<span>Bacteria is needed to convert nitrogen gas/ammonia into nitrates for "enhancing" the growth of plants.</span>
Answer: A (physical property)
Explanation:
It says they both had clear liquids in each cup and since ice floats on water the only option that makes sense is A. There were no chemical, magnetic, or temperature tests made.
The growing problem In the video is when water is not getting in the tree roots.