Necessary+to+life
31life-support system — n a system that provides all or some of the items (as oxygen, food, water, and disposition of carbon dioxide and body wastes) necessary for maintaining life or health: as a) one used to maintain the health of a person or animal in outer space,… …
32life-sup|port system — «LYF suh PRT, POHRT», the equipment necessary to maintain human life where a normal environment is lacking. A spacecraft s life support system enables the crew to live outside the earth s atmosphere …
33necessary — 01. To really learn vocabulary, it is [necessary] to study it in a variety of ways. 02. It is really [unnecessary] to bring anything to the party; we have lots of food, and plenty of stuff to drink. 03. Higher prices do not [necessarily] mean… …
34Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …
35Life cycle assessment — A life cycle assessment (LCA, also known as life cycle analysis, ecobalance, and cradle to grave analysis) is the investigation and valuation of the environmental impacts of a given product or service caused or necessitated by its existence.… …
36necessary — nec|es|sar|y1 [ nesə,seri ] adjective *** 1. ) essential or needed in order to do something, provide something, or make something happen: I don t want to be disturbed unless it s absolutely necessary. necessary for: basic foods regarded as… …
37necessary — {{11}}necessary (adj.) late 14c. needed, required, essential, indispensable, from O.Fr. necessaire necessary, urgent, compelling (13c.), and directly from L. necessarius unavoidable, indispensible, necessary, from necesse unavoidable,… …
38necessary — adjective 1) parental permission is necessary Syn: obligatory, requisite, required, compulsory, mandatory, imperative, needed, de rigueur; essential, indispensable, vital 2) a necessary consequence Syn …
39Life peer — Peerage The peerage assemb …
40life span — 1. the longest period over which the life of any organism or species may extend, according to the available biological knowledge concerning it. 2. the longevity of an individual. [1915 20] * * * Time between birth and death. It ranges from a… …
