If you were looking to study tissue regeneration after injury, which model organism would you be least likely to select? C. elegans (roundworm) S. cerevisiae (yeast) Drosophila melanogaster (fruitfly) Xenopus (frog) Mus musculus (mouse)

*Saccharomyces cerevisiae* (yeast) would be the least likely model organism to select for studying tissue regeneration after injury. While yeast is a powerful model organism for studying fundamental cellular processes, it is a single-celled organism and therefore does not have tissues to regenerate. The other organisms listed are all multicellular and have varying capacities for tissue regeneration, making them more suitable for such research.<br />