<span>     The body has to do this to make sure and or to prevent damage to the delicate tissues that form the Respiratory System. This is important because </span>Your body's organs, such as your heart and brain, need oxygen-rich blood to work well. (if it gets damaged by the Cold/Dry air you breath in on a daily)<span><span>Respiratory failure </span>also can occur if
your lungs can't properly remove carbon dioxide (a waste gas) from your
blood. Too much carbon dioxide in your blood can harm your body's
organs.
Hopefully i helped ^.^ please mark brainly if its a possibility~ 
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Answer:
A: Synonyms
Explanation:
Synonyms are two words that have same meaning but are different words (tell me if this works!)
 
        
                    
             
        
        
        
Answer: The mass of the nucleus is less than the mass of the 8 protons and 8 neutrons. 
Explanation:
 
        
             
        
        
        
For #1, I'd say it's "It will usually bond to multiple atoms which can provide a total of 4 additional electrons." 
2. Ionic (I'm quite certain because anions/cations (-1 & +1) are Ionic from what I recall, if that's true it's Ionic. 
3. "comparison of the associated families to which the elements belong" and
 "the difference in electronegativities" are what I would choose, as I mentioned in a comment earlier. 
If I'm wrong let me know, but I am at least 80% sure that these responses are correct from what I remember in Chemistry. 
 
        
                    
             
        
        
        
B. slows down is your answer, obviously as it approaches carrying capacity, there would be less available space to find in the place of inhabitance, so less and less population units would be able to find the place of inhabitance suitable for living, or can't find enough space to live in.