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Scientific theory definition, a coherent group of propositions formulated to explain a group of facts or phenomena in the natural world and repeatedly confirmed through experiment or observation: the scientific theory of evolution.
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roots spread out underground like the branches of a tree as to get sufficient water and nutrients form the soil to transport to the other parts of the tree for its own growth , by spreading out roots tend to collect or suck the maximum nutrients
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<em>Human interaction within ecosystems can have both positive and negative impacts on the levels of biodiversity. The impact of an increase in the human population , including increased waste, deforestation , peat bog destruction and global warming has been to reduce biodiversity .</em>
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