Which of the following terrestrial biomes is the most diverse in terms of the number of species?

Rainforest, by about a million light years...but don't take my word for it...

"More than half of the world's species of plants and animals are found in the rainforest. Rainforests support a very broad array of fauna, including mammals, reptiles, birds and invertebrates. Mammals may include primates, felids and other families. Reptiles include snakes, turtles, chameleons and other families; while birds include such families as vangidae and Cuculidae. Dozens of families of invertebrates are found in rainforests. Fungi are also very common in rainforest areas as they can feed on the decomposing remains of plants and animals..."

http://en.wikipedia.org/wiki/Rain_forest#Flora_and...