In experimental design, especially those involving drug treatment, specimens (e.g mice, rabbit etc) are drafted into several groups to study their degree of response to the particular drug being investigated.
Of all, a group of specimens named NORMAL is usually NOT exposed to treatment in order to
- allow objective comparison between scientific parameters before and after experiments
The answer is: " invasive " . _______________________________________________________ "<span>The boa constrictor in the Everglades is an example of an <u> invasive </u><u /> species that is impacting local species." _______________________________________________________</span>
