Microscopes allowed scientists to observe Prokaryotic cells which make up Bacteria and Archaea. These cells are small and contain no membrane- bound organelles. It allowed them to observe Eukaryotic cells with a nucleus and membrane-bound organelles that perform different life functions.
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Heat releasing reactions are called Exothermic reactions and Endothermic reactions absorb/utilize heat making their surrounding cold, so they rather absorb heat rather than release cold.
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Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat. Examples include areas which have been cleared of existing vegetation (such as after tree-felling in a woodland) and destructive events such as fires.
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Hot, less-dense air rises.
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