The construction of wind farms has affected the migratory patterns of some bird populations. bird populations have been noted
to no longer increase and sometimes even decrease in these areas. what is this known as?
a density-dependent limiting factor
a population-independent factor
a density-independent limiting factor
a population-dependent limiting factor

This is known as a density-independent limiting factor

Explanation:

Limiting factors are representatives in the circumstances that manage several appearances of a community. Unusual limiting factors appear into action based on the quantity of the group, and others are independent of the group frequency.

The density-independent limiting factors section influences the increase rate autonomous of the inhabitant's quantity value for a particular person. These determinants do not gain constant improvements to maintain the size of the population beneath power. It affects sudden and unpredictable variations in population size. Poor populations are unusually at danger of implying washed out by this kind of factor.

Here the unpredictable variations in population size of birds due to construction of wind farms is explained, which falls under this kind of factor.

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.