cientific theories become hypotheses.
Scientific theories are never proven.
Scientific theories become scientific laws.
Scientific theories summarize patterns found in nature.
Answer:
Glycolysis, which is the first step in all types of cellular respiration is anaerobic and does not require oxygen. If oxygen is present, the pathway will continue on to the Krebs cycle and oxidative phosphorylation. However, if oxygen is not present, some organisms can undergo fermentation to continually produce ATP.
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Passive transport must occur to maintain homeostasis. Active transport must occur to get the needed nutrients in and out of the cell.
