A control group in an experiment is a group or individual that serves as a standard of comparison with another group or individual to which it is identical except for one factor.
This is called the dependent variable.
A standard DNA test would rank them as siblings.
Let's do another experiment!
Scientists then state another hypothesis and test it out with another experiment.
Every electron is identical. Not similar, IDENTICAL.
Placebo Group Comparison Group This was a conversation we had tonight with our daughter and it was driving me crazy. It just came to me....were you thinking of CONSTANT? http://dictionary.reference.com/browse/constant
to compare something to another thing
contrast or juxtaposition