Refer to the following terms: articles, blogger's, there's.
explain the use of the "s" or "apostrophe s" in each word.

In Articles, the s means that there is more than one article. In Blogger's, the apostrophe s means that something belongs to the blogger. In there's, the apostrophe s means that it's joining two words together, so "there's" is equivalent to "there is."

Ithink that the answer is a