User:Sofia blue/sandbox

Life is a characteristic distinguishing objects having signaling and self-sustaining processes from those that do not either because such functions have ceased (death), or because they lack such functions and are classified as inanimate Biology is science concerned with the study of life.

Any contiguous living system is called an organism. Organisms undergo metabolism, maintain homeostasis, can grow, respond to stimuli, reproduce and, through natural selection, adapt to their environment in successive generations. More complex organisms can communicate through alternative means.[1][5] A diverse array of living organisms can be found in the biosphere of Earth, and the properties common to these organisms—plants, animals, fungi and bacteria—are a carbon- and water-based cellular form with complex organization and heritable genetic information.

The Earth was formed about 4.54 billion years ago. The earliest life on Earth existed at least 3.5 billion years ago during the Eoarchean Era when sufficient crust