A geographic coordinate system<span> or a GCS uses a three-dimensional spherical surface to define certain locations on earth. Also, a GCS is often mistakenly called a datum, but a datum is just one part of a GCS.
Finally, a GCS includes a prime meridian, </span><span>an angular unit of measure, </span>and a datum :)
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One thing they COULD do is have the St.Louis and Houston Stations both send out very high wave frequencies and figure out from there what the magnitude is and send it back to LA, but that might take a bit of time, depening on if power cables aren't down.
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D) Anaerobic organisms must have come first because there was no oxygen in the atmosphere.
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I hope this helps
Have an AMAZING day :)
-Emma