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resources that nature can produce again and again in a relatively short period of time such as lumber
resources that nature can not replace quickly enough to meet people's needs such as fossil fuels
resources that are never used up as they are being used such as sunlight, wind, or waves
long-term alteration in global weather patterns, including increases in temperature and storm activity
the distance that light travels in one year; used to measure vast distances (1 light year=just under one trillion kilometers)
the struggle between organisms for limited resources such as food or light (ex: between weeds and flowers for the same nutrient supply)
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