Which of the following regions of the globe exhibits highest species diversity?

The largely tropical Amazonian rain forest in South America has the greatest biodiversity on earth - it is home to more than 40,000 species of plants, 3,000 of fishes, 1,300 of birds, 427 of mammals, 427 of amphibians, 378 of reptiles and of more than 1,25,000 invertebrates.