To understand the development of the biosphere, it is necessary to abandon the image of passivity long attributed to living organisms—except, of course, for humans, who have traditionally been considered the sole entities endowed with self-determination. Contemporary evolutionary theories, while remaining faithful to the foundational Darwinian framework, reveal living beings as anything but passive. They show organisms capable of influencing their phylogenetic trajectory, not as bearers of a predetermined plan but by virtue of possessing agency, that is, the capacity to define their own direction. Today, concepts such as niche construction, epigenetic inheritance, and relationally influenced polyphenism are integral to this new synthesis theory. This is especially evident in the animal kingdom, where the subjectivity and personality of individual organisms enable them to interpret their innate heritage.