Answer:
         
       <u> </u><u>Role of websites in internet</u>
- Websites give the online way to the business,it helps the business to grow and reach the higher audience. There was a time,at which there is no apps only HTML/CSS websites are there so it is a building step for reaching the audience.
 
- Time is a one of the major factors for growth in online sector, and websites provide a interface to use their resources and services at less time ,you don't have to go somewhere now you can order from anywhere and anytime. 24/7 hour services gives a boost to the websites.
 
- Some of the Applications are Very big but you can access them in very less amount of internet. Apps never replace websites.
 
- Most of the billionaires are the ones who builds there website like amazon, twitter etc. It is very important to have a website for the business        
 
         <u>Importance of internet in our daily life</u>
- Internet provides various resources and services which we need at every time like booking a cab,hotel,flight,trains and tutoring services . It consist a vast variety of information which is required at every moment .
 
- We really don't need any physical presence of someone to learn something , to understand or for asking it is enough up on internet. Things are changing as technology grows.
 
- For leisure time, it provide social sites to enjoy and there are much good options to ask the question of any subject.      
 
- It also give option to promote business , it helps to reach to higher audience, many companies give services to us as there business. Digital marketing is also up there to promote on social sites.
 
 
        
             
        
        
        
Answer:
Check the explanation
Explanation:
The programmable code to solve the question above will be written in a python programming language <u><em>(which is a high-level, interpreted, general-purpose programming language.)</em></u>
<u><em /></u>
f = open('thisFile.txt', 'r')
w = open('thatFile.txt', 'w')
count = 0
for line in f:
    if count % 2 == 0:
        w.write(line)
    count += 1
w.close()
f.close()
 
        
             
        
        
        
Answer:
The fill handle copies the same values, formulas, or fills a series of dates, texts, numbers, and other data to a desired number of cells. ... Click and hold the handle, then you can drag up, down, across over other cells. When you release your mouse button, it auto-fills the content to the cells you dragged over.
 
        
             
        
        
        
Answer:
b. foreign key
Explanation:
In the database world, a foreign key is a field on one table and a primary key for another table. The purpose of a foreign key is to provide linkages between two or more tables. Given two tables A and B, and making A the point of reference, a primary key is a field that is unique in A while a foreign key is unique in B. 
On another hand, a composite primary key is a combination of two or more fields/columns on database table that can be used to uniquely identify each row in the table.
In the database lingua, what we have is a unique key not a distinct key, though the two words are similar in meaning.
A duplicate key is used when an information may be repeatedly entered on a table.
So the correct option is a foreign key.