A reproductively isolated population or group capable of interbreeding to produce fertile offspring is a:​

A) ​genus
B) ​category
C) ​family
D) ​species

Reproductively Isolated

A state in which different groups of organisms can no longer interbreed and produce fertile offspring, leading to speciation.

Fertile Offspring

Offspring that are capable of reproducing, indicating successful genetic combination and viability.

Species

A fundamental category in biological taxonomy, defined as a group of organisms capable of interbreeding and producing fertile offspring.