<span> chemical </span>energy<span> from organic molecules like glucose is</span>used<span> to make atp. This process is called cellular respiration. Then, atp provides the </span>energy<span> for most </span>biological<span> processes. hope it helped :)
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Concerning your heart, that's the circulatory system
Your lungs are the respritaory system
The vas deferens are a fibromuscular tube which connect to the epididymis, and is an excretory duct of the testis.
Hope I could help! :)
