When Someone finds it.
There are many ways in which you can classify an unknown species. To classify an unknown species you can compare it to similar species.
No - there are over 40 known species and no species are known to have become extinct.
A species is a group of closely related organisms. Organisms belong to the same species if they can mate and produce fertile offspring. A lion and tiger are not the same species because they can make a liger, but it will not be fertile.
there are thousands of known endangered species on earth however that are thousands of more unknown endangered species
The only known dinosaur to live in Oregon was an unknown species of Hadrosaur.
the pacific has more that 1,234,768 known species in the pacific ocean. There are more than 7,000 UNKNOWN SPECIES in just the pacific.
It they are unknown how would we know if they are unknown
Nobody knows the exact number of known species of deep sea fishes. There are too many species that cannot all be listed. The most deep sea fishes are yet unknown.
Conifer
Australia
:( this is an unknown species!
A short, pointy-eared, green one. The name of Yoda's species is unknown.