Which base is normally used in the synthesis (making) of rna but not in the synthesis (making) of dna?

Uracil Is the answer i could find.

:3

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

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.