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Body systems are groups of organs and tissues that work together to perform important jobs for the body. Some organs may be part of more than one body system if they serve more than one function. ... Examples include the respiratory system, nervous system, and digestive system.
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On October 3, 1902, President Theodore Roosevelt met with miners and coalfield operators from the anthracite coalfields in Pennsylvania in an attempt to settle the strike, then in its fifth month. The country relied on coal to power commerce and industry and anthracite or “hard coal” was essential for domestic heating.
