More than 150 years after the publication of On the Origin of Species, the origin of species remains an unsolved puzzle. Uncovering the source of eukaryotic species' genotypic and phenotypic diversity would be of tremendous aid in understanding the larger species' origin picture. In this study, we demonstrate that the comparison of mitochondrial DNA clocks to nuclear DNA clocks necessitates the existence of created nuclear DNA heterozygosity within the "kinds" of the Creation week. We also show that created heterozygosity, together with the operation of natural processes that are observable today, is sufficient to account for species' phenotypic and genotypic diversity. Our Created Heterozygosity and Natural Processes (CHNP) model significantly advances the young-creation explanation for the origin of species, and it makes testable predictions by which it can be further confirmed or rejected in the future.