I think my teacher made a mistake on this question or am I wrong?
 Which is the largest group of organisms?
 1. birds
 2. eukaryotes
 3. prokaryotes
 I chose 2. eukaryotes
 Keep in mind he said which is the largest group of organisms, a eukaryote is any organism that has eukaryotic cells (which have nucleus unlike the prokaryotic cells). Birds are eukaryotes so I don't really understand why I got it wrong. Either way would be correct because birds ARE eukaryotes...