Your friend wants to have her DNA tested because she thinks it will help her identify what foods she should eat. What is your advice to her

IT WANT IT JUST SSY YOUR BLOOD TYPE

the answers are a and c

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.