What is the relationship between the three items in each of the following groups, and identify each as an element, compound or mixture:

hydrogen, oxygen, and water;
nitrogen, oxygen, and air;
sodium, chlorine, and table salt;
carbon, water, and table salt;

 well hydrogen (element) and oxygen(element) combine together chemically to form water (compound)

nitrogen (element) and oxygen (element) combine chemically to form reddish brown gas nitrogen oxide which is a [pollutant and pollutes air (mixture) 
or 
nitrogen (element ) and oxygen (element) are components of air (mixture) 

sodium (element) and chlorine (element) combine together chemically to form sodium chloride which is table salt (compound) 

if we heat table sugar an organic compound of carbon,hydrogen and oxygen then an oxidation reaction will occur and will result in the formation of carbon (element) as the sugar will get charred and water (compound) as hydrogen will react with oxygen.   Hope this helps!

In order for her body to act correctly, Lucille's cells require glucose and oxygen.

A problem with Lucille's respiratory system leading to low levels of oxygen in her cells is known as Hypoxemia.

Having low levels of oxygen in her cells will make it difficult for Lucille to play soccer because she would not be able to breathe .If her respiratory system doesn't function properly, so enough oxygen molecules will not move into her respiratory system , ensuring that her cells won't have enough oxygen molecules. Playing soccer is difficult if you don't have enough air.

Explanation:

ABOUT HYPOXEMIA -: It is called hypoxemia to have low oxygen levels in your blood. It is called hypoxia to have insufficient oxygen levels in the tissues. Hypoxemia at high altitudes can occur. Hypoxemia that induces low levels of oxygen in the tissues of the body is called hypoxia. The two words are often used by people interchangeably, but they are not the same thing.

The capacity of the body to supply normal amounts of oxygen to the blood can interfere with a number of conditions and circumstances. Some of hypoxemia's most prevalent causes include:

Heart problems, heart defects included  .

Lung disorders such as asthma , bronchitis, emphysema.

High-altitude areas where oxygen is lower in the air.  

Powerful drugs for pain or other conditions that delay respiration .

Sleep apnea (breathing impairment during sleep)  .

Lung tissue inflammation or scarring (as in pulmonary fibrosis).

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Hope this helps :)