OK well first of all I hate biology but I like writing so you can use :: The molecular reactions of cellular respiration transform Krebs cycle into the more readily available bond energy of ATP.
When bonding occurs a new substance with new properties is formed.
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The answer is: Both association with mycorrhizal fungi and presence of root hairs.
Well because they need to survive. And whoever gets the most food will grow the biggest and produce the most offspring. This even happens between inter species like ants, an example of this is when the red imported fire and caused the near extinction of the native argentine ant in the United States