theories-explain, organize, predict hypotheses-testable prediction operational definition-clear procedures used to define and measure research variables replication is important because it helps us reassure ourselves that our outcome was correct and to see if we must change our hypotheses or correct something in our experiment
Deforestation is when people cut down trees (which means less oxygen for the people). Soil degradation associated with poor soil fertility management practices is a major factor underlying poor agricultural productivity in sub-Saharan Africa. About 65% of the agricultural land is degraded, mainly due to low nutrient application, soil erosion and soil acidification.
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It expands faster than someone speaking in a crowded street it can go around the globe and influence more people than standing in the corner over a box of soap saying the same that you could be typing also it can harm in a greater way since once something gets to the internet it is there forever.
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