By Jerry Bobrow
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Additional info for Basic Math and Pre-Algebra (Cliffs Quick Review)
By analogy, human social systems similarly increase in level of complexity and expand spatially and temporally from the individual to the household or expanded family, the farm or village, the county or province, and the country or continent. A parallel hierarchy is identified in agricultural systems which encompass crop plants or domestic animals, fields or herds, crop communities, agroecosystems, and regional production systems. We suggest, along with Altieri  and other authors writing on agroecology and sustainable agriculture, that agricultural systems are the dynamic end result of the interactions, in ecological time, of ecological and social/economic systems (see Fig.
Population growth exerts enormous pressure on the world's agricultural systems to satisfy food, fiber, and nonfossil fuels needs. 86 billion ha of forest and woodlands, accelerate desertification of fragile environments, and force into agricultural production semiarid lands and Page 6 wetlands that are at best marginal for sustainable crop production but are critical for the preservation of biodiversity in these fragile environments. In spite of increasing reliance on agricultural production, the percentage of the population directly involved in agriculture has declined continuously throughout this century, requiring the remaining farmers to extract the maximum possible yields from their lands (Fig.
A parallel hierarchy is identified in agricultural systems which encompass crop plants or domestic animals, fields or herds, crop communities, agroecosystems, and regional production systems. We suggest, along with Altieri  and other authors writing on agroecology and sustainable agriculture, that agricultural systems are the dynamic end result of the interactions, in ecological time, of ecological and social/economic systems (see Fig. 2). The specific crops that can be grown successfully in a given region are defined primarily by the kinds of crop genotype interactions with the environ- Figure 1 Hierarchical sequence of ecological, social/economic, and agricultural systems.