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?
He needs to ask scientists what they think.
He needs to conduct the experiment for a longer period.
He needs to use a larger sample size.
He needs to test more factors in the environment.
Answers
Answered by
4
Answer:
he needs to test more factors in the environment
as just soil and water are not the only factor for plant growth
plant growth mainly depends upon many other factors such as:
- light exposure(photo period;wave length of light; intensity of light)
- micro nutrients, aeration ,microbial activity ,macro nutrients of the soil
- climate & weather conditions of the area
- plant growth hormones
Answered by
3
Answer:
Its C.
Explanation:
I took the test on edgenuity. It wasnt D.
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