What is a possible source of variation that created the one amino acid difference between two animals in the hemoglobin sequence?

i think that c)gold was found there

but i am not sure

check for the pregnancy rating of drug. if its class c or d see if other alternatives

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.