According to Robert May's global estimates,what is the total number of species on Earth?

Match the following columns regarding the global species diversity of vertebrates and plants:

Column-$I$	Column-$II$
$(P)$ Birds	$(I)$ $12 \%$
$(Q)$ Mammals	$(II)$ $31 \%$
$(R)$ Amphibians	$(III)$ $23 \%$
$(S)$ Gymnosperms	$(IV)$ $32 \%$

What percentage of the world population lives in India (in $\%$)?

How many species have been identified till $2004$ in the world?

Which one of the following has the highest number of species in nature?

According to the $IUCN$ Red List $(2004)$, $784$ species have become extinct in the last $500$ years. Match the extinct species given in Column-$I$ with their respective numbers in Column-$II$.

Column-$I$	Column-$II$
$(P)$ Vertebrates	$(I)$ $338$
$(Q)$ Invertebrates	$(II)$ $87$
$(R)$ Plants	$(III)$ $359$