According to $IUCN$, when a taxon is facing an extremely high risk of extinction in the immediate future, it is
Extinct in wild
Endangered
Critically endangered
Vulnerable
Full forms : $UNESCO$
Species-area relationships among very large areas like the entire continents the $Z$ values in the range of
A renewable exhaustible natural resource is
Using the figure, determine the percentage of bird species that will be lost if the island's inhabitable land area is reduced from $100,000\, km^2$ to $1\, km^2$.
$A$ : Island and area $(km^2)$
How do scientists extrapolate the total number of species on Earth ?