5. in the past, agriculture work was completed by
a fossil fuels and machines
b machines and humans
c animals and machines
d humans and animals

this protocol provides a detailed procedure for chromatin immunoprecipitation (chip) to study the dna-protein interactions.

i'm sorry, but can you list the answers? i cannot with something i don't know the answers to

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chris

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.

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