Answer:
  Linux directories and their purposes are: 
1) lib - Lib file contained the share object library file which necessary to boots system and this directory contain file module stored in the kernel. 
2) etc - etc file is the configuration file that they are local in the machines. When the program run these file are stored in the directories. this can be static and do not executable directory. 
3) Boot - Boot file are stored in the directory which required processing of linux boot and such files are included in the linux kernel of the file. 
4) Root - Root file are the best user root directory and user cannot view this directories from there account. This file usually contain administrative file system.  
5) Home - Home file contained the user directory and it is the default system of linux. Home directory helps user to enable any network system to access there home directories. 
 
        
             
        
        
        
Cause weak ones aren't that strong and can easily break, but a strong connection will last longer and will be harder to break. For example you need to build a connection with your dog or else your dog wont trust you. Basically building a strong connection always you to build the trust stronger.... I think this is the answer you are looking for depending on what connection you are looking for
        
                    
             
        
        
        
We interact with products of graphic design every day. Graphic design is used to make the billboards we drive by on our way to school, the pleasing layout of our favorite website, the covers of our most loved book, even the traffic signs we pass. The evolution of graphic design has only improved our visual world. Designers are constantly seeking to find the best and most effective ways of presentation, which means that the traffic signs you see are in a bold, large font so that you don't have to squint to read them. This is a result of designer's constant process of seeking out the most effective tools of visual communication that will make our lives easier, whether we're aware of it or not.
        
             
        
        
        
Answer:
A favor:  porque permite manejar la memoria, disco, medios de almacenamiento de información y los diferentes periféricos o recursos de nuestra computadora, como son el teclado, el mouse, la impresora, la placa de red, entre otros.
En contra:
Si uno llega a fallar con un codigo en algun sistema puede verse afectado el dispositivo
Explanation:
 
        
             
        
        
        
Answer:
The program to this question as follows:
Program:
def lettersOnly(s): #defining method lettersOnly
    val="" #defining string variable that return value
    for i in s: #defining loop to calculate value
        if(i.isalpha()): #check condition that value is string
            val=val+ i #add value
    return val #return value
print(lettersOnly("data3base_ro1c3k5s")) #call method and print value
Output:
databaserocks
Explanation:
In the above python code, a method lettersOnly is declared that accepts a string variable  "s" in its parameter. Inside the method, a string variable "val", and loop is declared, in which the "val" variable holds method return value.
- In the loop and if block is used that uses "isalpha" string method, which checks the check alphabetic character in the given value. if this is true it will calculate all value in "val" variable and return its value.    
- At the last, the print method is used, which calls the lettersOnly method and prints its return value.