Natural selection is a central concept of evolution.
n æ t̠ʃ ə ɹ ɹ ə l WORD_BOUNDARY s ɪ l ɛ k ʃ ə n WORD_BOUNDARY ɪ z WORD_BOUNDARY ʌ WORD_BOUNDARY s ɛ n t ɹ ə l WORD_BOUNDARY k ɑ n s ɛ p t WORD_BOUNDARY ʌ v WORD_BOUNDARY ɛ v ə l uː ʃ ə n WORD_BOUNDARY