One of the endangered species of Indian medicinal plants is that of

Many species like $Steller's$ sea cow and passenger pigeon have been driven to the brink of extinction. Which of the following describes this situation?

Match the column $I$ with column $II$:

Column $I$	Column $II$
$(a)$. Thylacine	$(i)$. Russia
$(b)$. Dodo	$(ii)$. Mauritius
$(c)$. Quagga	$(iii)$. Australia
$(d)$. Steller's sea cow	$(iv)$. Africa

Threats to biodiversity come from:

$Parthenium$ (carrot grass) that came into India has become ubiquitous in occurrence and causes pollen allergy.

The Russian species that became extinct in recent years is . . . . . . .