Why do organisms change over time? How does the past help us predict the future? (think of the before/after cows)

Organisms change over time due to natural selection and genetic mutations.

Explanation:

An example of natural selection is the finches the scientist Charles Darwin studied in the Galapagos Islands. The finches had different shaped beaks which allowed them to adapt to different environments. An example of genetic mutation is if a person had an extra finger.The past helps us predict the future because if a change happened in the past to an organism, we can use the same change and apply it to other organisms which can help us determine what is to come in the future. Hope this Helped!!

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.