Answer
Biodiversity, indeed. Vernadsky's groundbreaking work laid the foundation for understanding the immense diversity of life forms and their intricate interconnections within ecosystems. By coining the term "biosphere" and recognizing that life itself shapes and influences the Earth's evolution, he championed a holistic perspective of the natural world. His insights highlighted the delicate balance and interdependence between organisms, paving the way for contemporary ecological concepts like sustainability, conservation, and ecosystem services.