Between length, mass, and time, which were simplest to measure with high accuracy and high precision and why?

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

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the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d