There are two types of cellular respiration, these are aerobic and anaerobic respiration. Anaerobic respiration can occur in the absence of oxygen, but for aerobic respiration to occur, oxygen must be present. The process of aerobic cellular respiration involves a series of oxidation and reduction reactions and the oxygen molecule serve as an electron donor and acceptor during this process. Thus the stages of cellular respiration can only occur if oxygen is present. <span />
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a secondary consumer is something who eats the first consumers. first consumers are things that get energy from the sun. such as plants. do pretty sure it's d
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They both involve topics related to the natural world, and are both based on empirical evidence. <span />
