Biologists reckon that about three to a hundred million other living species still languish unnamed in ignominious darkness. The statement means:
a) All these living species have become extinct.
b) All these living species have become homeless.
c) People are not aware of the existence of all these living species.
d) All these living species are endangered.
Dear student
This statement means that c) People are not aware of the existence of all these living species.
Regards
This statement means that c) People are not aware of the existence of all these living species.
Regards