The level of ecological diversity representing organisms sharing the same habitat or community is termed as:

$(1)$ More than $\underline A\%$ of the drugs currently sold in the market worldwide are derived from plants.
$(2)$ Although all the biodiversity hotspots put together cover less than $\underline B\%$ of Earth's land area,the number of species they collectively harbour is extremely high,and strict protection of these hotspots could reduce the ongoing mass extinction by almost $\underline C\%$.

Developing or underdeveloped nations are rich in which of the following aspects?

How many megadiverse countries are there in the world?

Match the following with respect to different categories of the red list. Choose the correct option.

Column-$I$	Column-$II$
$i$. Extinct	$a$. Species whose members survive only in captivity.
$ii$. Extinct in wild	$b$. Rapid population decline of $50\%$ to more than $70\%$ over the previous $10$ years.
$iii$. Endangered	$c$. Species in which the last individual has died.
$iv$. Vulnerable	$d$. Rapid population decline of $30\%$ to more than $50\%$ over the previous $10$ years.

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