Ijust need a couple reasons. why might some kinds of living things undergo sexual reproduction at times when conditions in their environment become less favorable?

This form of reproduction leads to more genetic variability and higher chances of survival.

When conditions in the environment become less favorable, the form of reproduction becomes preferable because it increases the chances of the offspring surviving.

Offspring of such reproduction are genetically more diverse than their parents, unlike those from other  reproduction which are of the same genetic composition as their parents.

With more variability, the offspring have a higher chance of surviving the unfavorable environment than their parents.

More on advantages of reproduction can be found here: link

Because of adaptation (genetic variation).

Explanation:

Some organisms might undergo sexual reproduction at times when conditions aren't favorable, because the offspring will start adapting, so that what was once a "less favorable" condition, is now more favorable.

The goal of all that, is basically to create a genetic variation that consists in making the individuals better adapted to the environment: to make the environment more favorable.

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→ Keep in mind that, the environment doesn't change at all, what changes is how the organisms react to it.

For example, imagine that your punch is the environment, and that wood was the previous set of organisms, and that iron is the second set of organisms. If you punch both of them (given that your punch doesn't change), you'll note that there is a difference between punching wood and iron. The punch wont change, but how the material (which in this case represents our organisms) reacts to the punch, does change.

Hope it helped,

BiologiaMagister

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

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.