There is such a phenomenon in nature: when a plant grows alone, it appears short and monotonous. When it grows with many similar plants, it has deep roots and lush leaves and full of vitality. People call this phenomenon of mutual influence and mutual promotion in similar plant circles as symbiotic effect.
According to the above definition, which of the following is most consistent with the symbiotic effect?
In a dormitory of a university, six students' admission scores were different. For four years, six students studied together every day. Finally, they were admitted to graduate students in key universities.