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Biology 13 Online
OpenStudy (anonymous):

Fan and Medal To living organisms, the most dangerous debris from tephra is probably _____, because it spreads so widely. As for earthquakes, can be used to monitor tremor activity of volcanoes. A.seismic calculators B.seismographs C.tiltmeters

OpenStudy (anonymous_user):

Is there a fourth option?

OpenStudy (anonymous):

I think it's B.

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