A. Because it’s hard to classify all of the varieties of animals. B. Because their methods of biological research are inadequate. C. Because they have difficulties in getting enough funding for saving the animals. D. Because they are unwilling to make efforts to save every endangered species.
A. Because it’s hard to classify all of the varieties of animals.
B. Because their methods of biological research are inadequate.
C. Because they have difficulties in getting enough funding for saving the animals.
D. Because they are unwilling to make efforts to save every endangered species.