The very first signs of life appeared roughly 4 billion years ago. However, direct evidence of life came from fossils 3.465 billion years old. The fossils belonged to ancient unicellular organisms that may have resembled today’s cyanobacteria.
Ever since then, life has evolved into a multitude of lifeforms from microscopic microbes to multicellular plants capable of deriving energy from the sun. Explore more fascinating topics by registering at BYJU’S.