In one butterfly species, the colors of individuals range from white to black, with many shades of gray in between. If the butterflies in a mountain population become more and more similar in color over several generations (e. g., if most butterflies are the same shade of gray), what kind of evolutionary force is likely acting on the population?

Incomplete dominance

Explanation:

Incomplete dominance describes the force behind the emergence of an heterozygous phenotype (gray-coloured butterflies) as offspring of two contrasting homozygous phenotypes (white-coloured and black-coloured parent butterflies)

Furthermore, incomplete dominance set in when neither of the parent traits is dominant over the other.

Thus, gray-colour appear as an intermediate of the white-colour and black-colour

the correct answer is sex-linked recessive.

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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.