The "baby boom echo," represented by people who are 24 to 33 years old in 2014, is the result of

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answer: b. nucleolus

explanation: nucleolus is a structure in the nucleus are ribosomes are made.

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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.