Final answer:
A counterbalanced design in biology does not have a control group. Instead, it uses multiple groups that receive different treatments in a specific order, with each participant acting as their own control.
Step-by-step explanation:
A counterbalanced design is an experimental design that does not use a control group. Instead, it uses multiple groups that receive different treatments in a specific order. Each participant in the study serves as their own control group.
For example, let's say we want to study the effects of sleep on memory. We could have participants go through two conditions: one where they get a full night of sleep and one where they are sleep-deprived. Half of the participants would start with the full night of sleep condition, while the other half would start with the sleep-deprived condition. This way, each participant acts as their own control, as their performance is compared within the same participant across conditions.