In aerobic respiration.there are stages in it.but I think you are looking for word "Krebs cycle"
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C: Earth scooped out that can form a lake or deep valley
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The environment will impact positively if the human activities are positive and negative if the human activities are negative. It is worthy of note that our actions and activities contribute greatly to the way and manner our environment response to us.
I think the correct answer from the choices listed above is option A. Short character sketches are called characterizations. These are representation of a character or characters in a stage or writing. Hope this answers the question.