Solved by a verified expert:What are the various options discussed by Wilson for gathering information about the scope of global biodiversity? What are the major limitations of each approach?

Wilson,E. O. 1992. The Diversity of Life. (2nd ed.) W. W. Norton and Co., New York. (ISBN 10: 0-393-31940-7, ISBN 13: 978-0-393-31940-8)