Which of the following statements about species,as defined by the biological species concept,is (are)correct?
I.Biological species are defined by reproductive isolation.
II.Biological species are the models used for grouping extinct forms of life.
III.The biological species is the largest unit of population in which successful interbreeding is possible.
A)I and II only
B)I and III only
C)II and III only
D)I,II,and III

Question

Quizplus · Accepted Answer

Statement I is correct, as the biological species concept defines a species as a group of organisms that can interbreed and produce viable offspring but are reproductively isolated from other groups. 
Statement II is incorrect, as the biological species concept is primarily used for grouping extant (living) forms of life, not extinct ones. 
Statement III is correct, as the biological species is defined as the largest group of individuals in which two individuals can produce fertile offspring, and is thus a unit of population rather than a taxonomic classification.

Which of the Following Statements About Species,as Defined by the Biological