RESEARCH STUDY 13.4: Dr.Fletcher is interested in understanding whether joining a fraternity/sorority causes people to become more concerned about their attractiveness and appearance.He recruits a group of 55 freshmen (25 males, 30 females) who are planning to go through fraternity/sorority recruitment on his campus.After they join, he gives them a measure of attractiveness concern/appearance concern (the Body Concern Scale, where higher scores indicate higher body concerns).
In addition to measuring the group of participants who joined a fraternity/sorority, Dr.Fletcher decides to give the same measure to another group of 55 participants who decided to not join a fraternity/sorority.Based on the results below, explain whether Dr.Fletcher should be concerned about a maturation threat to internal validity. 
Definitions:
Beating Flagella
Flagella that exhibit a whip-like motion to propel cells through liquid environments, common in many single-celled organisms and the sperm of many multicellular organisms.
Motile Larvae
Larval forms of certain animals capable of movement, often playing a crucial role in dispersal and the life cycle.
Adaptation
The process by which organisms adjust to changes in their environment through genetic change or behavior to enhance survival and reproduction.
Living on Land
The adaptation of life forms to survive and thrive in terrestrial environments, as opposed to aquatic or marine habitats.
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