Why is food important for the human body? Mention 4 main purposes.

Your body needs food to obtain energy, to get building blocks for your body, and to get substances that help control body processes. Nutrients, chemicals in food that your body needs, include carbohydrates, proteins, lipids, vitamins, and minerals.

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true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

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.