Certain species of fish swim in large clusters called schools, whose function is not entirely understood. Experiments have shown that individual fish, when removed from a school, demonstrate higher heart rates than those found within the school. Fish may experience stress at being separated from fellow members of their species, but an alternative explanation is that, for hydrodynamic reasons, swimming alone requires more physical exertion.
Which of the following, if discovered in an experiment, would support one of the two hypotheses and undermine the other?
【选项】
When individual fish are isolated from their school but are permitted to swim in close proximity to others members of their species, their heart rates remain normal.
选项是否正确？