Where does the cotton come from that is used to make clothing?

plants
algae
bacteria
worms

Plants

Cotton is a a soft, staple fiber that is obtained from the seeds of cotton plant, which belong to the genus Gossypium. The fiber is spun into yarn or thread that is used to make cloths. It is a highly valuable fiber for textile industry.  

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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.