Imagine this field of flowers. environmental conditions change. the climate becomes colder and the winds become fierce. such a climate favors plants that grow close to the ground, have needles, and have bright flowers. in this field of flowers, only the shortest plants survive. over time, the population consists of very short, low growing plants. this is also an example of selection.
a) directional b) disruptive c) environmental d) stabalizing

Option (A)

Explanation:

Directional selection is usually defined as a type of natural selection method where the genetic variance of a particular population moves towards a new type of phenotype due to their exposure to the frequent changes that occur in the environment.

This method leads to a decreasing rate of genetic variability. In nature, this method results in the evolutionary trend of a population towards one particular end of the trait spectrum.

Thus, the correct answer is option (A).

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

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.