The first expansion pack, University, came out on March 1st, 2005.
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The first expansion pack released was University.
no, you do not need your Sims 3 disk, but you will need the disk for the expansion pack you want to install.
It is The Sims 3 Ambitons, which is largely focused on careers and was released on June 2010.
There are no mermaids in any of the Sims games or expansion packs.
If you are talking about installing a Sims 2 expansion to the Sims 1, it is impossible. You can only install the Sims 2 expansion packs into the Sims 2, not The Sims 1 or 3.