Johannes wants to know whether soil, water, or both are needed for plant growth. He chooses to conduct experiments on a willow tree for five years to answer his question. How can his experimental methods be changed to improve his experiment?
1- He needs to ask scientists what they think.
2- He needs to conduct the experiment for a longer period.
3- He needs to use a larger sample size.
4- He needs to test more factors in the environment.
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he needs to test more factors in the environment
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To conduct this experiment, Johannes needs to know the characteristics of a willow tree in order to grow it. It is said that willow trees grow well near water and damp soil.
In order to make sure that the experiment stays successful, Johannes has to test more factors in the environment.
Lets say; sample A has more water and soil content, sample B has high water content, low soil and more sunlight exposure and so on. This will help Johannes to get the best possible answer.
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