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SCIENCE & FUTURE  is the best topic
2 3 2
2.My childhood
is it ok???????
if ok plz mark as the brainliest
Sorry by mistake I marked someone else as the brainliest but actually I was satisfied with your answer
its ok 
The Brainliest Answer!
1.) Environment
2.) Pollution
3.) Population
4.) Introduction each other

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remember me again if you have ques.