A genus with a single species is

A genus having single species is known as

A genus having many species is known as

A genus having many species is known as

Study oforganisms of a single species in relation to their environment is termed

If more then single species of fish is cultured at a time, then it is called

Ecological study of single species is :

All human races are a single species.

Ecological study of single species is called

Ecological study of single species is called :

Brinjal and potato belong to the same genus Solanum, but to two different species. What defines them as separate species ?