Answer:
By using the subsets.
Step-by-step explanation:
Evolution is the change in the species characteristics with the changing environment and the passage of the time. Different ideas has been put forward by the scientists to study the evolution.
The organization of the trait groups can be done by using the different subsets. Different sets can be used for example A and B. The set A that is used can be used as the subset of the B group and vice-versa. The traits present in the A set must be present in the B subset as well.
Thus, the answer is by using the subsets.