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Bio_006_USA FY21 Question: 1-4
From about 4 bilion years ago to about 25 billion years ago, oxygen gas became more common in Earth's atmosphere Oxygen was a toxic compound to most life forms from that time period Today, oxygen is required by all
but some of the most primitive life forms. Which statement best explains how early life forms that were harmed by oxygen evolved into today's life forms that require it?
o Warming temperatures allowed the colonization of land environments, where oxygen was more plentiful
O Carbon dioxide using species all became extinct, which allowed oxygen-using life forms to flourish in shallow oceans
Over time, many species gradually adapted to a more oxygen-rich environment, allowing them to survive in shallow water and on land
The growth of seas allowed early species to survive using dissolved carbon dioxide in seawater rather than using it directly from the ait
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answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation:

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.  

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).