One of your controlled sims has to have reached the top of the natural science career. i think that career is only available with the Sims 2 University expansion.
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Don't feed it for a full day. Eventually it will automatically eat any non-controllable Sim who passes it. If you don't want that Sim eaten, you should be able to "Shoo" them before the damage is done. Otherwise you'll have to either resurrect them or let them die.
No, you cannot have Sims 2 pets on Sims 3. You must have Sims 3 pets for Sims 3 or Sims 2 pets for Sims 2.
the sims 2 double deluxe is the sims 2 + the sims 2 nightlife + the sims 2 celebration stuff pack
there are loads the sims 2 sims 2 university sims 2 pets sims 2 nightlife sims 2 open4bussniss sims 2 castaway sims 2 (one with shops(sorry i dont know what its called)) sims 2 glamour lif and many many more cat
sims 2 deluxe is 2 in one - sims 2 and nightlife, sims 2 is just one in one - sims 2 -the base game Sims 2 Deluxe has Night Life already in it.