Biodiversity refers to $........$

How many species of birds are found in Colombia?

What is a species called that is restricted to a specific geographical area?

Given below are two statements.
Statement-$I$: The number of species present in an area is always proportional to the area.
Statement-$II$: For larger areas like the entire continent,the number of species found increases faster than the area explored.

Among the classes of invertebrates that represent global biodiversity, which are the most abundant?

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.