The difference between the two students that we know of is that they used a different meter stick. So the difference would be best attributed to the different tools they used.
Note, this is quite a huge difference. It's likely that one of the sticks, or both, are quite defect.
A punnet square is used to visually see the dominant and recessive traits. Mendel's law says that alleles pair independently during the formation of gametes (aka sex cells). This means that traits are transmitted to offspring independently of one another.
Reduction is to bring down the size or value of intensity of a certain thing. Decrease is to decrease or “bring down” of a quantity or to become smaller.
B. is a protective structure made of cellulose fibrils
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