What doesn't need to eat to live?

Certain organisms, such as some bacteria and archaea, can survive without consuming traditional food sources by utilizing inorganic compounds or energy from chemical reactions, a process known as chemosynthesis. Additionally, some extremophiles can thrive in environments devoid of light or organic matter, relying on minerals and other non-organic substances. Furthermore, certain types of fungi can derive energy from decaying organic matter instead of actively "eating" in the conventional sense.