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| 6385711033 | Species | The ability to interbreed in nature and produce viable, fertile offspring. | 0 | |
| 6385711034 | Reproductive Isolation | Pre-zygotic: before zygote Post-zygotic: after zygote | 1 | |
| 6385711035 | Temporal Isolation | Pre-zygotic. Differences in timing of breeding cycles prevent reproduction. | 2 | |
| 6385711036 | Behavioral Isolation | Pre-zygotic. Differences in courtship behaviors prevent mating from taking place. | 3 | |
| 6385711037 | Habitat Isolation | Pre-zygotic. Two species who occupy different habitats within the same area may not encounter each other, and therefore do not reproduce. | 4 | |
| 6385711038 | Mechanical Isolation | Pre-zygotic. Morphological differences prevent reproductive success. | 5 | |
| 6385711039 | Gamete Isolation | Pre-zygotic. Sperm of one egg may not be able to fertilize the egg of another species. | 6 | |
| 6385711040 | Reduced Hybrid Fertility | Post-zygotic. Chromosome incompatibility make offspring of two different species infertile. | 7 | |
| 6385711041 | Reduced Hybrid Viability | Post-zygotic. In some species a hybrid zygote will form, but will not complete development or is born frail. | 8 | |
| 6385711042 | Hybrid Breakdown | Post-zygotic. Original hybrids are robust and vigorous, however, offspring of these hybrids are small and/or sterile. | 9 | |
| 6385711043 | Allopatric Speciation | The formation of new species in populations that are geographically isolated from one another. | 10 | |
| 6385711044 | Sympatric Speciation | The formation of new species in populations that live in the same geographic area. | 11 | |
| 6385711045 | Adaptive Radiation | Period of evolutionary change in which groups of organisms form many new species whose adaptations allow them to fill different ecological roles in their communities (availability of habitats increases rates of speciation). | 12 | |
| 6385711046 | Polyploidy | Cells fail to divide and tissue becomes tetraploid. Tetraploid tissue makes diploid gametes continuing polyploidy (creates an extra set(s) of homologous chromosomes). | 13 | |
| 6385711047 | Gradualism | The hypothesis that evolution proceeds chiefly by the accumulation of gradual changes. |  | 14 |
| 6385711048 | Punctuated Equilibrium | The hypothesis that evolutionary development is marked by isolated episodes of rapid speciation between long periods of little or no change. |  | 15 |
| 6385711049 | Speciation | The process by which one species splits into two or more species. | 16 | |
| 6385711050 | Hybrid Zone | A region in which members of different species meet and mate, producing at least some offspring of mixed ancestry. | 17 | |
| 6385711051 | Morphological Species Concept | Characterizes a species by body shape and other structural features. | 18 | |
| 6385711052 | Ecological Species Concept | Characterizes a species by its ecological niche, the sum of how members of the species interact with the nonliving and living parts of its environment. | 19 | |
| 6385711053 | Phylogenetic Species Concept | Characterizes a species as the smallest group of individuals that share a common ancestor, forming one branch on the tree of life. | 20 | |
| 6385711054 | Reinforcement | Strengthening reproductive barrier | 21 | |
| 6385711055 | Fusion | Wearing of reproductive Barrier | 22 | |
| 6385711056 | Stability | Continued production of hybrid individual | 23 |
