Organelles
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The study of early development of organisms is called embryology.
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That body parts are called "Homologous Organs" which are similar in origin & structure.
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Aerobic and anaerobic respiration each have advantages under specific conditions. Aerobic respiration produces far more ATP, but risks exposure to oxygen toxicity. Anaerobic respiration is less energy-efficient, but allows survival in habitats which lack oxygen.
Within the human body, both aerobic and anaerobic respiration are important.
The answer is C: a pollutant.