A biological system is a complex network of biologically relevant entities. ... Examples of biological systems at the macro scale are populations of organisms. On the organ and tissue scale in mammals and other animals, examples include the circulatory system, the respiratory system, and the nervous system. source: google
50%x 4842 because of you in your account number and you are now in 48525
Your body breaks down protein and then uses the nucleotides to build protein again because you need the protein for your body so you can gain energy
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