Gene targeting can be used to study the function of a gene. Which of the statements describing gene targeting are true? I. The use of gene targeting is limited to model organisms, such as rats, where gene targeting methods are well established.
II. Gene targeting can be used to introduce a point mutation into an existing gene to observe what happens when the gene is modified.
III. Gene targeting to delete a gene can be performed on an adult organism so that the before and after effects can be observed.
IV. Gene targeting can be used to turn off a gene to observe what happens when the gene is not expressed.

you can have just about every answer you can think of

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.