Life is a characteristic that distinguishes physical entities that have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased, or because they never had such functions and are classified as inanimate. Various forms of life exist, such as plants, animals, fungi, protists, archaea, and bacteria. Biology is the science concerned with the study of life. There is currently no consensus regarding the definition of life. One popular definition is that organisms are open systems that maintain homeostasis, are composed of cells, have a life cycle, undergo metabolism, can grow, adapt to their environment, respond to stimuli, reproduce and evolve. Other definitions sometimes include non-cellular life forms such as viruses and viroids. Abiogenesis is the natural process of life arising from non-living matter, such as simple organic compounds.
关于Life
The interconnecting stories of Gail, David, Belle, and Hannah set in apartments in a house in Manchester.
Life的成就
Calvin Demba is known for his work in Kingsman: The Golden Circle.
您不知道Life的热门事实
Life Category.. Biology The study of life - Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field.. Astrobiology - Astrobiology, formerly known as exobiology, is an interdisciplinary scientific field concerned with the origins, early evolution, distribution, and future of life in the universe. Astrobiology considers the question of whether extraterrestrial life exists, and if it does, how humans can detect it.. Biosignature - A biosignature is any substance – such as an element, isotope, or molecule – or phenomenon that provides scientific evidence of past or present life. Measurable attributes of life include its complex physical or chemical structures and its use of free energy and the production of biomass and wastes.. Evolutionary history of life - The history of life on Earth traces the processes by which living and fossil organisms evolved, from the earliest emergence of life to present day.. Lists of organisms by population - This is a collection of lists of organisms by their population. While most of the numbers are estimates, they have been made by the experts in their fields. Species population is a science falling under the purview of population ecology and biogeography.. Phylogenetics - In biology, phylogenetics is a part of systematics that addresses the inference of the evolutionary history and relationships among or within groups of organisms.
