In this image, although it is difficult to see, there is a small spider weaving a web on the tree. In order to make the web, or perform any other internal or external function, the spider needs to spend ATP, or Adenosine Triphosphate. Adenosine Triphosphate is a nucleotide, which organisms use as a currency for energy transfer. Every action requires ATP to be spent, so organisms use cellular respiration to produce more ATP by converting nutrients from food.


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