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

Match the following columns:

List-$I$	List-$II$
$(a)$ Dodo	$(1)$ Africa
$(b)$ Quagga	$(2)$ Russia
$(c)$ Thylacine	$(3)$ Mauritius
$(d)$ Steller's sea cow	$(4)$ Australia

The colonisation of tropical........ by humans is said to have led to the extinction of more than $2000$ species of native birds.

Which alien species was introduced into Lake Victoria?

When does wildlife face the greatest threat of extinction?

Of the four major causes for the loss of biodiversity (Alien species invasion,habitat loss and fragmentation,over-exploitation,and co-extinctions),which according to you is the major cause for the loss of biodiversity? Give reasons in support.