What is complementary base pairing? Why is it necessary?

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Complementary base pairing is important in DNA as it allows the base pairs to be arranged in the most energetically favourable way

It is essential in forming the helical structure of DNA. It is also important in replication as it allows semiconservative replication

A complementary base is either of the two nitrogen-containing sections of a nucleotide that bond together to connect strands of DNA or RNA

DNA and RNA are complex molecules that are central to genetics and both are made of things called nucleotides.

Explanation:

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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.