Biology/biology question
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Question
QUESTION: How many variables should an experiment have?
ANSWER: Three variables
independent
dependent
controlled
---------- FOLLOW-UP ----------
QUESTION: How many variables are there in an experiment with wet soil, dry soil, and
light?
It seems that you have two studies here. What is the hypothesis? Are you studying plant growth or the effect of light on soil moisture. If plants are involved Soil moisture and light would be independent variables. Contols would also be needed. Your results would be thye dependent variable.
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Answers by Expert:
Walter Hintz
Expertise
Science teacher for over 50 years. MSc. in biology. I can answer questions in general biology, zoology, botany, anatomy and physiology and biochemistry.
Experience
I have a MSc in biology and have been a science teacher for over 50 years. At present I am a faculty member at a college and a science consultant at seven catholic schools.
Publications
The Ohio journal of Science
Momentum-The Journal of the Catholic Education Association
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