IPA: /ˌhɛtəˈrɒdʒəni/
KK: /hɛtəˈrɔdʒəni/
The process or condition of being diverse or varied in form or character.
The heterogeny of the species allowed for a wide range of adaptations to different environments.
Heterogeny → It is formed from "hetero-" (from Greek "heteros", meaning different) and "genus" (from Greek "genos", meaning kind or race). The word refers to the condition of being of different kinds or types.
Think of 'different' ('hetero-') kinds or types ('genus') coming together — that's what heterogeny means.