The best thing to do is this:
the subjects in the experimental group should be given large, daily dose of vitamin C while the control group subjects should be given a daily dose of sugar pills that are disguised as vitamin C.
The research can then observe the differences between the two groups.
Its D) <span>Microbes allowed plants to uptake nitrogen-containing compounds through the process of nitrogen fixation.</span>
Answer:
D. They control small specific functions in the cell.
Explanation:
A single undifferentiated cell. For example, in human, this was the embryo.
