The exploration of molecular,genetic,and species-level diversity for products of economic importance is known as $..............$

Which of the following has maximum genetic diversity in India?

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.

Paul Ehrlich,by the Rivet Popper hypothesis,has explained:

Exploring molecular,genetic and species-level diversity for products of economic importance is called:

The total number of biodiversity hotspots in the world is