Life Brainy Quotes
Life is a characteristic that distinguishes objects that have signaling and self-sustaining processes from those that do not, either because such functions have ceased (death), or else because they lack such functions and are classified as inanimate. Biology is the science concerned with the study of life. Scientific evidence suggests that life began on Earth approximately 3.5 billion years ago. Microbial mats are among the oldest clear signs of life, as microbially induced sedimentary structures (MISS) formed 3.48 billion years ago have been found in western Australia. The mechanism by which life emerged on Earth is unknown, although many hypotheses have been formulated. Since then, life has evolved into a wide variety of forms, which biologists have classified into a hierarchy of taxa. Life can survive and thrive in a wide range of conditions.