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.

Both continental drift and glacial cycles are correct because they create significant environmental pressures—such as geographical isolation, habitat fragmentation, and drastic climatic shifts—that force organisms to adapt, migrate, or undergo speciation. Options (a) and (b) are incorrect because they fail to recognize that both long-term tectonic movements and periodic global cooling are equally fundamental drivers of biological change. The core concept tested is the impact of Earth’s dynamic physical and climatic history on the process of organic evolution.