A review of fossil evidence found throughout the geologic periods on Earth would indicate that during the Silurian period A) the Earth's overall climate was much warmer. B) the majority of Earth's surface was covered by glaciers. C) the majority of Eath's surface was no longer under water. D) the continents as we know them today were joined together.

answer:

I think the answer is A.

The Sarah's overall climate was much warmer.

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.  

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