Anything that is living is said to have life. Things that can grow, respond and produce their own kind, are said to have life. Things that have life grow and eventually die. Life comprises all the living forms on the Earth, from a single-celled organism to a huge multi-cellular organism; from simple living forms to complex living forms. It is said that life began on the Earth around 4.1 billion years ago. The simplest and earliest life forms appeared under water first. Mammals are one of the most evolved life forms till date.
What is Life?
