Once you verify your site through the Google's Webmasters Tool (by adding their code into your home page's HTML) should that code be removed or it has to stay there for further Google Bot's visits?
And, BTW how do you submit a sitemap to Google. I mean, I already have a XML site map on my site. Do I submit the same one? And if so, what is the point? Google knows about it.
what is a site map?