You start finding short hairs in your apartment and you conclude that your roommate is keeping a stray cat in the apartment even though you have a "no pets" clause in your lease. You decide to send these hairs to a crime laboratory for testing. You can send them to either a public or a private crime lab to get results, although it will be more expensive to send them to the private crime lab. Please explain why this is not true

oxygen +1 most likely

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.

carbon traps heat so more of it makes it hotter causing global warming. during the ice age carbon levels in the atmosphere were low so it got very cold. so the common things between them is carbon levels in the atmosphere.