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mammals and other animals, examples include the circulatory system , the respiratory system , and the nervous system . on the micro to the nanoscopic scale, examples of biological systems are cells , organelles , macromolecular complexes and regulatory pathways. a biological system is not to be confused with
basic components of the nervous system . these specific systems are widely studied in human anatomy and are also present in many other animals. respiratory system : the organs used for breathing , the pharynx , larynx , bronchi , lungs and diaphragm . digestive system : digestion and processing food with...
https://en.wikipedia.org/wiki/Biological_system