Mammalia is the group with all mammals.
Vertebrata is the group with all vertebrates.
The skeletal structures of both the bats and the humans developed from the same embryonic tissue for the main reason that both of these skeletal contains the humerus, radius, ulna, and the five digit bones. In addition, the main difference that these structures have is that the bat's wing is longer compared to the human arm.
The answer is A. Areas with high numbers of endemic species
