Practice question

Question

A researcher studying a cricket species finds that individuals on either side of a large river have different call frequencies on average. The following statements were made: A. The different call frequencies may signal incipient speciation B . The change in call frequency can lead to allopatric speciation C . Individuals of one population transplanted to the other population (across the river) may have lower chance of finding mates than residents D . Call frequencies have changed from ultrasound to infrasound across the river If the call helps attract mates which of the above statements are correct?