Aman and a woman have three children: two girls and one boy. the couple decides to have a fourth child. what is the probability that their fourth child will be a girl?

   50%

Explanation:  In the creation of the fetus, chromosomes from the sperm of the male and chromosomes from the egg of the female are joined. Both man and woman have two sex cell chromosomes, with the woman having both X chromosomes and the man having one X and one Y chromosome.

If the X chromosome from the sperm joins the X chromosome from the egg, it means that the fetus has two X chromosomes, as a mum has it, then it will be a girl. If the sperm chromosome Y joins the X chromosome from an egg then the fetus will have one X and one Y chromosome, as daddy has, then it will be a boy. This means that a man i.e. his chromosome affects the gender of a child.

Still, scientists say that equal percentages can vary based on many factors. For example, the Y chromosome is slightly smaller than the X chromosome, and therefore more mobile and faster, so it can reach the egg more easily. Then diet and lifestyle can also change the equal percentage i.e. equal chance, so it can vary by 50%. But again scientific evidence shows that the germ cells do not have the capacity of memory, that is, they do not remember which sex of the child was at the last fertilization of the egg, so with the small deviations noted, the chances are approximately always 50 %.

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explanation:

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.