Which option identifies the substance that will accomplish the goals in the following scenario? A grower has been using Cornell Mix B (half peat, half perlite) as his soil-free growing medium, but has found that the growing system is causing much of the perlite to float to the top of the plug containers. The grower wishes to switch to something other than perlite to achieve a similar effect with a heavier substance that, like perlite, will still hold water. The replacement, however, must also provide good drainage to improve the drainage of the peat, which can retain too much water and drown the plugs.

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69 is the correct math for the amino acids

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.