write a letter to your uncle in the city telling him why you want to spend the next Christmas holidays with him​

dear uncle my main aim Of writing this. letter is to inform you of holiday I think I will love to spend my holiday with you this Christmas I want to be in a new environment so if u may permit me I will be greatful

cell regulation is conducted by special proteins.

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.