IPA: /ˌbaɪoʊdʒəˈɡræfɪkəl/
KK: /baɪoʊdʒəˈɡræfɪkəl/
Relating to the study of the distribution of species and ecosystems in geographic space and through geological time.
The biogeographical patterns of the region reveal how species have adapted to their environments over time.
Biogeographical → It is formed from "bio-" (from Greek "bios", meaning life) and "geographical" (from Greek "geographia", meaning to describe the earth). The word refers to the study of the distribution of life across different geographical areas.
Think of 'life' ('bio-') being studied in relation to the 'earth' ('geographical') — that's what biogeographical means.