GENERAL HISTOLOGY

Detailed explanation-1: -Under Control A controlled experiment tests only one factor at a time and consists of a control group and one or more experimental groups.

Detailed explanation-2: -A controlled experiment is a scientific test done under controlled conditions, meaning that just one (or a few) factors are changed at a time, while all others are kept constant.

Detailed explanation-3: -Yes, an experiment should test only one variable at a time. This ensures that the experimental outcome is clearly due to one identifiable factor.

Detailed explanation-4: -As mentioned in our publication Types of Clinical Trial Design, one of the designs is based, on the inclusion or not, of a control group to compare the effects of the investigational treatment. Trials that do not include it are called uncontrolled trials and those that do are called controlled trials.