Life exists all over the Earth in air, water, and soil, with many ecosystems forming the biosphere. Some of these are harsh environments occupied only by extremophiles. The life in a particular ecosystem …

Dec 13, 2025 · Life-forms present on Earth today have evolved from ancient common ancestors through the generation of hereditary variation and natural selection.

The meaning of LIFE is the quality that distinguishes a vital and functional being from a dead body. How to use life in a sentence.

Nov 30, 2021 · As such, the nature of life continues to be a hotly debated topic. This article focuses on the subject matter of biology: life. The first half of this article will focus on attempts to characterize life …

LIFE definition: 1. the period between birth and death, or the experience or state of being alive: 2. for the whole…. Learn more.

LIFE definition: the condition that distinguishes organisms from inorganic objects and dead organisms, being manifested by growth through metabolism, reproduction, and the power of adaptation to …

Life is a concept in biology. It is about what separates a living thing from dead matter. Most life on Earth is powered by solar energy: the only known exceptions are the chemo-synthetic bacteria living …

The timeline of life represents the current scientific theory outlining the major events during the development of life on Earth. Dates in this article are consensus estimates based on scientific …

Dec 13, 2025 · The existence of diverse definitions of life, as detailed in the previous section, surely means that life is complex and difficult to briefly define. A scientific understanding of living systems …

Jun 5, 2025 · FastStats is an official application from the Centers for Disease Control and Prevention’s (CDC) National Center for Health Statistics (NCHS) and puts access to topic-specific statistics at …