The nervous system controls everything you do, including breathing, walking, thinking, and feeling. This system is made up of your brain, spinal cord, and all the nerves of your body. The brain is the control center and the spinal cord is the major highway to and from the brain.
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research question: how do different humidity levels affect the heights of different types of trees
independent variable: humidity level
dependent variable: tree height
constants: temperature, light, duration of time
control group: tree left outside in normal conditions
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Other helpful techniques include planting more drought-resistant strains of corn and wheat; leaving crop residue on the fields to cover the soil; and planting trees to break the wind.
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the results will likely be recording and could inspire a new hypothesis.
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