Once the model is defined, especially when alternative models are available, observations and measurements can be made that will help raise or lower the model's plausibility. There are many possible models of origins. Genetic variations are limited. The earth has experienced a worldwide flood. Random mutations and natural selection brought about present living kinds from single-celled life.
All life has a common ancestor.
The evolution model is completely silent concerning the origin of matter, space, energy, time, and the laws of chemistry and physics. They admit they are scientifically blind prior to such an event. Creationists likewise have no scientific understanding of what happened during the creation event. Nevertheless, to the right of the red region, both models can be tested against the evidence. For any assumed starting condition in the past, scientists frequently ask if the laws of physics and chemistry would produce what we see today.