I think that the traced the organisms back to their ancestors<span />
Pathogenic protozoa comprise a large number of eukaryotic microorganisms which are the causative agent of important parasitic diseases. Some affect human and are of high medical relevance as malaria, toxoplasmosis, leishmaniasis, the Chagas disease, sleepiness disease, amebiasis, giardiasis, and trichomoniasis.
The answer would be 3...mass!
It is caused by mutations in the gene that helps an enzyme called phenylalanine hydroxylase, or PAH. <span />
