_____ Have Estimated That Up to 25% of the World's

_____ have estimated that up to 25% of the world's current animal and plant species could be gone by 2050, and 50% could be gone by the end of the century.

A) Edward O. Wilson and Stuart Pimm
B) Philip Levin and Donald Levin
C) Norman Myers and Aldo Leopold
D) Donald Levin and Stuart Pimm
E) Gas and oil company executives