Question

1. A group of scientists proposes an idea that a chemical compound will enable bean plants to grow faster.
They grow one group of bean plants in the presence of the compound and another group in the absence
of the compound. Then they write up a presentation about the experiment stating that the compound
promotes plant growth. Which step is missing in their methodology?
A. a hypothesis
B. a control group
C. data analysis
D. a conclusion​

Answer 1

Answer:

a control group...................