Which of the following phenomena might have influenced the evolution of organisms? 1. Continental drift 2. Glacial cycles Select the correct answer using the code given below.

1. Continental drift refers to the movement of Earth's continents relative to each other. Over geological time, this process has led to the separation and collision of landmasses, causing geographic isolation of populations. This isolation prevents gene flow and allows separated populations of organisms to diverge genetically, leading to speciation and thus significantly influencing their evolution. 2. Glacial cycles (periods of glacial advance and retreat) cause major climate changes, shifts in vegetation zones, and fluctuations in sea levels. These environmental changes create strong selective pressures, forcing organisms to adapt, migrate, or face extinction. The cycles influence species distribution, genetic diversity, and the overall trajectory of evolution. Therefore, both continental drift and glacial cycles are major phenomena that have profoundly influenced the evolution of organisms.