<em>Dead trees and down wood provide wildlife habitat it is estimated that 2/3 of all wildlife use them at least during one point of their life cycle.</em> They also serve to cycle nutrients, decreasing erosion, etc.
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The Sun spins on its axis in a way similar to the Earth revolving to give us day and night. Also, it 'wobbles' as the planets orbit it, in the same way your washing machine wobbles if the load is unbalanced.