Which of the following are causes of coastal erosion? check all that apply. beach grasses and other plants trap windblown sand. wave action carves away the coastline. groundwater under pressure is forced to earth’s surface. artificial structures stop the natural flow of sand along the coast. underground caves collapse as bedrock is dissolved.

Wave action carves away the coastline and Artificial structures stop the natural flow of sand along the coast are the causes of coastal erosion

Option B & D

Explanation:

Coastal erosion means the loss of the coastal land by removal of sediments. Coastal erosion mainly happens by the wave action which continuously hit the coast and remove the sediments. The materials taken by the waves should be replaced.

But man made constructions on the coastal area stands as a barrier. These constructions are not giving room for the sediments to get filled by the rivers draining into the Ocean.

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.