Researchers studied a group of 30 mice to determine if mice develop relationships with each other. The mice were bred, sterilized, and from birth all lived together in an enclosed habitat for three months. At the end of three months, each mouse was separated from the group for a period of three days. At the end of three days, each mouse was then allowed to either rejoin the group or continue to remain in isolation. All 30 of the mice chose to rejoin the group.
Researchers were able to determine that mice do in fact develop relationships with each other. However, critics of the study stated that the mice were all prompted to rejoin the group because of the placement of a food source, and within such a constructed habitat, determinations of relationship were more related to food than the other mice.
How do the parts of this explanation in bold typeface best relate to each other?