What was found on earth and meteorites from earth and showed evidence for microscopic life forms?

In 1996, a team of scientists announced the discovery of what they believed to be evidence of ancient microscopic life in a Martian meteorite known as ALH84001, which was found in Antarctica. This meteorite contained structures resembling fossilized bacteria and organic molecules that some researchers interpreted as signs of past microbial life. Additionally, studies of ancient rocks on Earth, such as those from hydrothermal vent environments, have revealed microfossils and stromatolites, further supporting the existence of microbial life forms in Earth's early history. These findings have sparked ongoing debates about the origins and evolution of life both on Earth and beyond.