The primary purpose of the passage is to A. draw on studies of the Philippine fruit bat in proposing a new theory regarding bats on oceanic islands B. show how recent research on the Philippine fruit bat reflects debates about bats on oceanic islands C. argue for the relevance of certain new evidence pertaining to the Philippine fruit bat for the study of bats on oceanic islands D. discuss recent investigations of the Philippine fruit bat in light of conventional wisdom regarding bats on oceanic islands E. explain why the Philippine fruit bat is atypical among bats on oceanic islands in terms of genetic variation