Endemic species are those that are........

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

Identify the correct statements :
$1.$ According to $\text{IUCN} (2004)$,the total number of described species is slightly more than $1.5$ million.
$2.$ Robert May estimated the total species diversity on Earth to be around $7$ billion.
$3.$ Insects make up more than $70 \%$ of all recorded animal species.
$4.$ India,with $2.4 \%$ of the world's land area,contributes $8.1 \%$ to global species diversity.

$A$: Tropics have more biodiversity.
$R$: Climate of tropical region is more seasonal.

Diversity which is seen specifically in one species is called what?

How many biodiversity hotspots have been identified by Norman Myers globally to date?