Yes, it is possible for life to exist based on elements other than carbon. While carbon is a fundamental building block of life on Earth, it does not necessarily mean that life in the universe must be carbon-based.
Carbon has unique properties that make it highly suitable for forming complex organic molecules and the diverse chemistry necessary for life as we know it. Carbon can form stable bonds with other elements, creating a wide variety of compounds and structures. Furthermore, carbon-based molecules can exhibit great versatility and stability, enabling the intricate biochemistry found in living organisms.
However, alternative biochemistries could exist. Other elements, such as silicon, nitrogen, phosphorus, and sulfur, have been considered as potential alternatives to carbon as the basis for life. These elements have some chemical properties that resemble those of carbon and could potentially support the formation of complex organic molecules.
Speculation on non-carbon-based life is largely hypothetical at this point, as we have not discovered any definitive evidence of life beyond Earth, let alone alternative biochemistries. Our understanding of the origin and diversity of life is based on the life forms we have observed on Earth. Nonetheless, the possibility of non-carbon-based life expands the potential for diverse forms of life in the universe, and it remains an intriguing area of scientific inquiry and exploration.