In the Amazonian rainforest,at least $.........$ insect species are yet to be discovered and named.

What is the full form of $UNESCO$?

$(1)$ 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 $\underline C\%$.

In the equation $\log S = \log C + Z \log A$,what does '$A$' represent?

The ................ have a greater amphibian species diversity than the .......

Select the incorrect statement regarding the plant $Rauwolfia$ $vomitoria$.