Snake Island is located approximately 21 miles off of the coast of Brazil. Evidence suggests that the mainland of Brazil and the island of Ilha da Queimada Grande were
connected as recently as 11,000 years ago before sea levels rose separating the two.
A particular genus of snake is found on both the mainland (Brazil) as well as the
island. The island species of the snake is calculated to be about 5x's more venomous
than his mainland relative. Describe the process that would have resulted in this
change over thousands of generations.

the answer is:

carbon dioxide

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.