Teacher:In this task, you are given a second sentence. Your task is to generate the first sentence on the same topic but incoherent and inconsistent with the second sentence.
Teacher: Now, understand the problem? Solve this instance: But while they may exist unnoticed , they can not be frequent , as the species are largely sympatric and closely related , yet remain distinct , with no signs of significant introgression .
Student:
Such hybrids could only be identified with certainty by DNA sequence comparison however .