Oxygen, however, is not produced by the human body and thus needs to be acquired through breathing<span>. Carbon dioxide and water are the two products of the process of cellular </span>respiration .<span> During cellular </span>respiration<span>, cells acquire the energy that they need to carry out their tasks.</span>
Answer:
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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C
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Photosystems 1 and 2 are here