Terrestrially, life is classified among four biological families: archaea, bacteria, eukaryotes, and viruses. Archaea are the recently defined branch that often survives in extreme environments as single cells, and they share traits with both bacteria and eukaryotes. Bacteria, often referred to as prokaryotes, generally lack chlorophyll (except ...

Nov 30, 2021 · Similarly, for any definition of life, one can either show living cases that are left out of the definition or non-living cases that are included by it. Life is organized, but so are geological formations. Life processes energy, but so does fire. Life evolves using complex biochemistry, but …

Jul 20, 2010 · The NASA definition of life has another virtue: it conveys information about what its framers believed to be possible ways to generate features we value in life. ... Biology on Earth consumed about half that time to get from the origin of Earth to a form of life that is considering surpassing the constraints of Darwinian evolution. Thus, only ...

Mar 01, 2000 · In any case, the definition of life as evolution by natural selection is at least less vulnerable to false positives than any other definition. Thus, it fares best in a challenge to search for extraterrestrial life. Introductory biology textbooks still define life as a checklist of characteristics (Purves et al. 1998, ...

American College of Pediatricians – March 2017. ABSTRACT: The predominance of human biological research confirms that human life begins at conception—fertilization. At fertilization, the human being emerges as a whole, genetically distinct, individuated zygotic living human organism, a member of the species Homo sapiens, needing only the ...

Biological as a adjective means Related by genetic lineage.. Dictionary ... The definition of biological is something that relates to life or living. ... Relating to, caused by, or affecting life or living organisms. Biological processes such as growth and digestion. adjective. 1. 0.

KIE: The unsettled question of when human life begins is a key issue in the abortion debate, and often figures in discussions of birth control, treatment of rape victims, fetal research, in vitro fertilization, and disposal of fetal remains. Goldenring proposes a brain-life theory, which maintains that a fetus becomes a biological human being when its brain begins to function at …

Medical Definition of biological half-life. : the time that a living body requires to eliminate one half the quantity of an administered substance (as a radioisotope) through its normal channels of elimination.

Everett Zhang's introduction clarifies the concept of "adequate life" by placing it within the context of Foucault's terminology of govemmentality and biopower (2): what is at issue is the inclusion of the biological life of the population into the way societies are governed and power is exercized.

The specific nature of living matter and the life processes may be characterized from the point of view of both material structure and the functions at the basis of all manifestations of life. The most accurate definition of life, which simultaneously embraces both these approaches to the problem, was offered approximately 100 years ago by F ...

Hereof, what is the best definition of biology? The word biology is derived from the greek words /bios/ meaning /life/ and /logos/ meaning /study/ and is defined as the science of life and living organisms. An organism is a living entity consisting of one cell e.g. bacteria, or several cells e.g. animals, plants and fungi.