Invertebrates constitute what percentage of the animal kingdom (in $\%$)?

Most of the industrialized nations are rich $............$ but poor in $............$.

India shares about . . . . . . % of total biodiversity wealth on earth.

Among the classes of invertebrates that represent global biodiversity, which are the most abundant?

Temperate evergreen forests are found in

What is the difference between flora, fauna, and vegetation? Eichhornia crassipes is called an exotic species, while Rauwolfia serpentina is an endemic species in India. What do these terms 'exotic' and 'endemic' refer to?