14. Viruses are strand of DNA or RNA that are surrounded by protein coats. They are so small that can be seen by the naked eye. Viruses enter health cells and take over by forcing the healthy cells to produce more cells. true or false​

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.