This article delves into the multifaceted mechanisms driving evolution, exploring the foundational principles of natural selection alongside advanced theories of cybernetics, symbiogenesis, and autopoiesis. Charles Darwin's concept of natural selection highlights the gradual adaptation of organisms, favoring traits that enhance survival and reproduction. This principle is further examined through the lens of sexual selection, which focuses on traits that increase reproductive success. Cybernetic theories, particularly those proposed by Stafford Beer, introduce regulatory functions and homeostatic balances that underscore the dynamic relationship between organisms and their environments. The role of symbiosis, as articulated in symbiogenesis, reveals how interspecies cooperation leads to significant evolutionary changes, such as the development of essential cellular organelles. The concept of autopoiesis and natural drift offers a paradigm where evolutionary change is a continuous adaptive process, maintaining structural and functional integrity within living systems. This perspective is expanded through the theory of system differentiation, which emphasizes the role of sexual reproduction and genetic recombination in driving species diversification and ecosystem complexity. Integrating these diverse frameworks, the article presents a comprehensive view of evolutionary processes, from the inheritance of acquired characteristics to the generation of new genetic variations through symbiosis and horizontal gene transfer. By synthesizing these insights, the article underscores the interconnectedness and resilience of living systems, offering profound implications for understanding biodiversity and the adaptive capabilities of life on Earth.