Both continental drift and glacial cycles have been important factors in influencing the evolution of organisms.

Continental drift is the movement of the Earth`s continents over time, which has led to changes in the physical environment and the formation of new habitats for organisms. For example, the separation of South America from Africa allowed for the development of distinct flora and fauna in each continent.

Glacial cycles refer to the repeated periods of cooling and warming that have occurred over the Earth`s history, leading to changes in the distribution and abundance of species. For example, during periods of glaciation, many species retreated to refugia (areas with more hospitable conditions) and then expanded their ranges again as the climate warmed, leading to genetic differentiation and the evolution of new species.

Therefore, both phenomena have had significant impacts on the evolution of organisms.