For a science IA, choose an independent variable that naturally has five distinct levels, like pH or temperature intervals, and aim for at least three repeat trials per level for reliable data. What nobody tells you is that getting five levels with proper repeats is tough in our crowded school labs—last month, my botany experiment on plant growth had to be cut to four light levels because we were sharing equipment with three other classes. So plan early and book your lab time, or you'll be scrambling.
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