Which best defines cohesion? a. cohesion is caused by polar water molecules attracting each other. b. cohesion is caused by polar water molecules repelling each other. c. cohesion is caused by polar water molecules repelling and not mixing with non–polar molecules.

Option A, Cohesion is caused by polar water molecules attracting each other

Explanation:

Cohesion leads to attraction of molecules towards each other. Water molecules being polar in nature exhibit strong cohesive force.

Due to its polar nature, water molecule align itself in a way that its one end becomes positive with H+ ion and the other end becomes negative with OH- ion.

Two water molecules get attracted towards each other through the formation of hydrogen bond between them, due to which high cohesion arises.

Hence, option A is the correct answer.

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.