Google Update, PageRank, Backlink Information

[Webmastergrace]

Given that SERP rankings are query string specific and are subject to algorithmic changes which, for Google, average in excess of 1 per day, and that there is not a single re-crawl rate for all pages, why should SERP rank behavior in way mimic the re-crawl frequency of any particular page?

ranking is not only depends on the only backlink it also depends upon the direct visitors which are coming your site to know exactly............................