earths life support systems,
1.a. water supports life on Earth and moves between the land, oceans and atmosphere.,
1.b. the carbon and water cycles are systems with inputs, outputs and stores
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1.a. Diseases can be classified and their patterns mapped. The spread of diseases is complex and influenced by a number of factors.,
1.b. There is a relationship between physical factors and the prevalence of disease which can change over time.,
1.c. Natural hazards can influence the outbreak and spread of disease
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