Answer D) Radiation
Answer comes from diagram shown in question
Answer:
If the inter breeding absent between the individual of different species due to some barrier or mechanism calles reproductive isolation.
Answer:
°Draws attention to the magnitude and importance of threatened biodiversity.
°Identifies and documents those species most in need of conservation action.
°Provides an index of the decline of biodiversity.
Establishes a baseline from which to monitor the future °status of species.