As a rule of thumb, in order to improve the reliability and accuracy of an experiment, it is best if the experiment is repeated several times. The increased number of trials ensures that the readings observed have minimal random error.
The answer is D) evolving
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In glucose the hydroxyl group at carbon four is below the plane of the ring. In galactose the hydroxyl group at carbon four is above the plane of the ring.
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using seeds from the same source.
using the same kind of soil for both groups.
giving the control and experimental groups the same volume of water.
keeping the light the same for the experimental and control groups.
measuring plant height the same way and at the same time for both groups.