Other biological molecules that contain the element of N would be nucleic acids such as DNA and or RNA. There are found in the nucleotides that constitute or make up these nucleic acids.
The third option, destroying cells
If it doesnt have a nucleus or a cell wall it is a prokaryote. also prokaryotes displayed in pictures tends to be longer
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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C would be the best choice
Dark occur in the stroma, and do not use light energy