# Approximately 50% of total would species are present on:-

$\begin{array}{1 1}(a)\;\text{Tropical rainforest}\\(b)\;\text{Temperate rainforests}\\(c)\;\text{Temperate deciduous forest}\\(d)\;\text{Coral reefs}\end{array}$

Approximately 50% of total would species are present on tropical rainforest
Hence (a) is the correct answer.