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Explanation:..........................
U can physically c the Phenotype of a trait(looks), but not the Genotype(DNA). Ik this is right because I learned about this last yr.
You should be changing the amount of water because the question isn't asking for temperature, amount of light, nor the amount of soil. You would be changing the amount of water because that is what you are experiment for.
Answer:
When cells split and increase they do this very important thing in order tonmake the new cells exactly the same as the previous before them. Each cell makes more of all it's genes. Then each one.splits into two with one group of genes in each one of the new cells. During the process they make sure that all are copied correctly.