Quick Look at this NASA picture of a giant black hole and read the paragraph.

Black holes cannot be seen without x-rays. if a telescope focuses on X-rays, we see a bright spot surrounding the black hole and a larger doughnut-shaped mass around that. The bright spot is gas, glowing at one million degrees. Any visible light it makes is absorbed by the doughnut-shaped mass of dust and gas around it. So we can only see it using X-rays. this is called a buried black hole.

What does the photograph show to support the paragraph?

A. a black hole seen in visible light without X-rays
B. a buried black hole that looks like a doughnut
C. million-degree gas inside a black hole
D. visible light and dust outside a black hole​

answer; i believe the answer is hydraulic action;

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.  

yes, because even though a theory has a  lot of evidence to support it, it is not always true