Differences among organisms in any given species are known as:
adnormalities
variations
O mutations
alleles

explanation:

okay now i don't know this but for the pints nothing else to say bye

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.