The most extensively studied organism in science-
100 % of scientific fact.
Shown here in its haploid, shmoo, diploid, and unfortunate spoor states. Which pretty much covers them all. Brilliant survivalists, they are, capable of extraordinary feats of self-preservation, and under extreme circumstances too, which makes it possible to capture their little airborne selves, cultivate them and use them in producing bread, beer and wine.
[Shown up there ↑ in 77 frames of a mere 47.84K -- no brag, just fact.]
Measuring yeast activity ↓ improvised with multipurpose measuring utility