does every eukaryotic organism have introns, or some dont? (just a simple yes or no, please dont give me a wikipedia link, i didnt find any info there)

not all eukaryotic genomes have been sequenced so we can't say for sure. Certainly the fugu (puffer fish) genome has very few and very small introns. I suspect that all eukaryotes have some introns - they are fundamental to splicing and gene regulation.