This document discusses how biological crises have influenced the evolution of species over geological times, using examples such as the extinction of dinosaurs and the rise of mammals.
Extract
[...] Evolution of Biodiversity - Biological Crises 1. According to document indicate what corresponds to a biological crisis. Justify. 2. According to document give the probable origins of the Cretaceous - Paleogene crisis about 66 Ma ago, During which dinosaurs and ammonites disappeared. Justify. 3. Using documents 1 and indicate how scientists have divided the geological times. 4. Using document explain how biological crises have favored evolution over geological times. Answer to question A biological crisis is the significant disappearance of existing flora and fauna. [...]
[...] Answer to question Biological crises have favored evolution over time because extinct species leave room for new species that were previously constrained in their development (example: dinosaurs and mammals). Sometimes we talk about vacant ecological niches and nature's horror of the void. In fact, mammals already existed during the era of dinosaurs, but they were poorly developed (quite small, like rats); with the extinction of the dinosaurs, mammals became the new dominant species, it was then that the emergence of large mammals became possible. [...]
