Can u really make money through online surveys?

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Daily we use to check our mails regularly. Some of us use to see some mails like EARN MONEY or EARN 1000 to 5000 per day or HOME & PART TIME BUSINESS like these so many of them send many mails to us even we don't know who are they? So now my question is how can we believe them? *( THESE IS NOT TO BLAME ANY ONE JUST TO KNOW THAT HOW MANY OF THEM WILL BELIEVE IN OTHER SITES)