There are more than six billion humans who all share the same basic structure. Scientists categorize body parts by function. There are many systems such as the cardiovascular system, the respiratory system, the digestive system, the urinary system, and the endocrine system. The body is an amazing machine, and these are just a few of the parts!
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Please note that this product will not work on newer Apple operating systems - specifically 10.9 (Mavericks) and 10.10 (Yosemite).