Example of parapatric speciation is:
Metal tolerant plants reflects key principle in quiz on speciation+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Metal tolerant plants aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Metal tolerant plants fits helps integrate natural selection, environment.
Ref: Coyne & Orr, Speciation, Chapter 1: Species Concepts and Isolation.