What benefit do offshore oil rigs have on the environment?

The correct answer is that the oil withdrawn from the oil rigs can be used to power large structures like ships.

Explanation:

The oil rigs are the efficient, positive, and direct modes of obtaining crude oil. It is a big composition or structure in or on the water body with the assistance of drilling wells, to process and to extract natural gas and oil, and to store the components on a temporary basis, unless and until they can be brought to shore for clearing and retailing. The crude oil obtaining from the rigs are used to fuel large structures like ships.

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.