Answer:
He shows the reader the consquemces and what will happen if we sont prevent it. 
 
        
             
        
        
        
The Meaning of this is that its a poem and the meaning is the sun would always shine. 
        
             
        
        
        
Decompression sickness manifests ITSELF with joint pain and it can be fatal.
'Itself is a word that is usually used as the object of a verb or preposition to refer to to an inanimate thing or an animal which has been mentioned previously as the subject of the sentence.
        
                    
             
        
        
        
Answer:
B, On September 23, 1999, NASA officials were aghast when the $125 million Mars Climate Orbiter vanished as it prepared to enter the red planet’s orbit.
Explanation:
The use of word imagery and mystery make this a good intro sentence. MAKE SURE IT MAKES SENSE THOUGH! I can't see which sentence is supposed to come after this, so make sure it makes sense with the paragraph