Answer:
Animals should not be used for performing experiments. I say this because while you are performing the experiment on the animal it may go wrong and cause that animal to lose its life. By doing so you are putting the animal in danger of testing things on them. Testing experiments on animals isn't the only way to figure out if soething works. Animals should not be used as guinea pigs. 
Explanation: That's all I got......hope it helps:)
 
        
             
        
        
        
The answer to this question is:
<span>Read these lines from the poem “The Bells,” by Edgar Allan Poe.
Which figure of speech is used?
How they tinkle, tinkle, tinkle,
In the icy air of night!
</span><span>C-"Onomatopoeia, Because it shows Tinkle Tinkle Tinkle which is a onomatopia"
</span> Hoped This Helped, <span>TStephymilabit
</span>Your Welcome :)
        
             
        
        
        
Answer:
superior
Explanation:
Superior means anything which is better in quality and merit than other thing.
In this sentence superior is the most suitable option because of the preposition “TO” used in the sentence .
The sentence needs any comparative adjective in which preposition TO  is used with it. While better is the most commonly used comparative but it needs preposition than and hence it cannot be used here.
Hence superior is most suitable answer to this question.
 
        
             
        
        
        
A. their youth lends itself to vigor and unity