In DSM, nicotine dependence is included under the general definition of substance dependence.  The essential feature of Substance Dependence is a cluster of cognitive, behavioral, and physiologic symptoms indicating that the individual continues use of the substance despite significant substance-related problems.
The Best Materials to Cover your Greenhouse. 1  Glass: The traditional greenhouse covering, glass is the preferred material for permanence. 2  Film Plastic: Film plastic is one sixth to one tenth of the cost per square foot of a glass covered structure.
Quick Answer. A greenhouse is an example of a microclimate. A greenhouse absorbs the heat of the sun and then releases it slowly over time. Greenhouses are used in areas where it is too cold to grow plants that require extra warmth. Continue Reading.