Check all the characteristics below that describe elements. one type of atom a pure substance more than one type of atom chemically combined elements

one type of atom; a pure substance

Explanation:

An element is defined as a pure substance. Each element is made of one type of particle only which can be an atom or a molecule.  

Example: Copper (Cu), gold (Au), oxygen (O), hydrogen (H), etc. All these elements are made of a single type of atom only.  

light dependent reactions:

light independent reactions:

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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.