In a controlled experiment what is the experimental group compared to?

Explanation:

In a control experiment the experimental group is the one which is subjected to be affected by the variables used in the experiment. The changes occurring after treatment yields the outcome of the experiment. But the control group is the one which is not treated with any variable. It is kept as a standard for comparsion with the experimental group.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.