Which of the following is not true concerning crop rotation? a. it reduces soil compaction by turning the soil. b. it grows different, dissimilar crops in series. c. it prevents the depletion of nutrients by any single crop variety. d. it improves soil structure and fertility.

Correct A). It reduces soil compaction by turning the soil

Crop rotation is the technique of growing a dissimilar or different type of crops in the same field. The practice of rotating crops help to improve the soil stability, it also helps to decrease the population of a pest by disturbing the life cycle of the pest and interrupting their habitat.

It makes the soil fertile as the legumes like groundnut and beans fix the atmospheric nitrogen in the soil. It also helps to control disease, and weed by disturbing their life cycle.

A is the answer you are welcome

answer; i believe the answer is (polygenic inheritance;

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.