Does the amount of sunlight affect sunflower height?
Defining what you want to learn (e.g., "Why won't my toaster work?"). The Scientific Method: Steps, Examples, Tips, and Exercise
Only change one thing at a time (the independent variable) so you know exactly what caused the result. Does the amount of sunlight affect sunflower height
Testing the hypothesis under controlled conditions. The Scientific Method: Steps, Examples, Tips, and Exercise
If a sunflower receives at least 8 hours of direct sunlight, it will grow taller than one receiving 4 hours.
Noticing a phenomenon or identifying a problem (e.g., "My toaster won't toast").
Accurate notes allow others to replicate your work, which is the hallmark of good science.