Which among the following shows highest amphibian species diversity?

The species,though insignificant in number,determine the existence of many other species in a given ecosystem. Such species is known as

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?

Diversity index commonly used in ecological studies is

Tropical regions show the greatest level of species richness because:
$A$. Tropical latitudes have remained relatively undisturbed for millions of years,hence more time was available for species diversification.
$B$. Tropical environments are more seasonal.
$C$. More solar energy is available in the tropics.
$D$. Constant environments promote niche specialization.
$E$. Tropical environments are constant and predictable.
Choose the correct answer from the options given below.

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