37.多數的生物學家估計全球現存生物種數 (the total number of extant species) 約為
(A) 50,000 to 150,000
(B) 500,000 to 1,000,000
(C) 10,000,000 to 80,000,000
(D) 5-10 billion
(E) 10-20 billion