Species diversity is maximum in .......... .

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.

The biodiversity increases when one moves from the pioneer to the climax stage. What could be the explanation?

About $1000$ different varieties of ..... have been estimated in India.

How many species of birds are found in the Amazon rainforest of South America?

Which of the following is also known as the 'Lungs of the Planet'?