They may face peer pressure and bullying. They can't support themselves so they can't, feed themselves, go to the bathroom by themselves, or even play with other kids. They probably can eve think straight sometimes so some my think they're d.umb or something. There are many other things they go through though. 
Hope these help. c:
        
             
        
        
        
Its a number when is the perfect square of 13. ;)
        
             
        
        
        
Answer: 2)
A mnemonic device
Explanation: A mnemonic is a tool or memory aid that helps people to remember or memorize things easily. It helps you to remember an idea or phrase with a pattern of letters, numbers, or relatable associations. Mnemonic devices may include special rhymes and poems, acronyms, images, songs, outlines, and other tools. In the question Luke makes up a sentence using the first letter from each base as the first letters for his words, repeating to himself to help him remember more easily the bases of DNA. In other words Luke formed mnemonics using the first letters of the DNA bases to remember them easily.