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Q.
In biological terminology, a group of similar organisms which are capable of interbreeding and producing fertile offsprings is called
The Living World
Solution:
As per the definition given by Ernst Mayr in 1964: "A species is a group of actually or potentially inbreeding populations that are reproductively isolated from other such groups."
A species may have subgroups, called subspecies or varieties, showing certain distinct features of their own.