This is a macromolecule that holds cell information in a coded form. made of sugar, phosphate and

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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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.