Where is $70\%$ of the world's total freshwater found?

Which one of the following is not observed in biodiversity hotspots?

Which of the following ecologists proposed the 'rivet popper' hypothesis?

The historic Convention on Biological Diversity,'The Earth Summit' was held in Rio de Janeiro in the year

Which of the following is correctly matched?
$I$. Alpha diversity - Number of species in a given habitat
$II$. Genetic diversity - Variation of the genes within species
$III$. Beta diversity - Diversity of the habitat in the whole region
$IV$. Species diversity - Product of the species richness and evenness

The relationship between species richness and area is described by a straight line on a logarithmic scale using which equation?