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| 13951265749 | Prezygotic Barriers | Impede mating before fertilization can even take place | 0 | |
| 13951265750 | Postzygotc Barriers | Prevent a hybrid zygote from developing into a fertile adult | 1 | |
| 13951265751 | Habitat Isolation | (Prezygotic) Species do not have many encounters because they spend their time in different places |  | 2 |
| 13951265752 | Temporal Isolation | (Prezygotic) Animals are reproductively active during different seasons |  | 3 |
| 13951265753 | Behavioral Isolation | (Prezygotic) Certain courtship rituals are preformed before mating takes place. |  | 4 |
| 13951265754 | Mechanical Isolation | (Prezygotic) Physical differences inhibit cross-fertilization |  | 5 |
| 13951265755 | Genetic Isolation | (Prezygotic) Biomechanical mechanisms may prevent gametes from fusing, or the reproductive tract in female may be an unfavorable environment. | 6 | |
| 13951265756 | Reduced Hybrid Viability | Hybrids do not completely development | 7 | |
| 13951265757 | Hybrid Breakdown | F1's are viable, but later generations are not | 8 | |
| 13951265758 | Reduced Hybrid Fertility | Hybrid offspring is sterile | 9 | |
| 13951265759 | Morphological Species Concept | A species is defined by body shape, size, and structure. |  | 10 |
| 13951265760 | Ecological Species Concept | Distinguished between species based on their ecology- its biological role in the community. |  | 11 |
| 13951265761 | Allopatric Speciation | Part of the population is geographically isolated from the rest of the population and forms a new species since it is reproductively isolated. |  | 12 |
| 13951265762 | Sympatric Speciation | Speciation occurs while the organisms are still cohabiting. (SAME) |  | 13 |
| 13951265763 | Adaptive Radiation | Diversely adapted species stemming from a common ancestor. Often occurs when a founder population settles in a new environment, or when extinction opens up ecological niches. |  | 14 |
| 13951265764 | Gradualism | Species diverge slowly overtime |  | 15 |
| 13951265765 | Punctuated Equilibrium | New species emerge suddenly then stabilize for a while before another divergence |  | 16 |
| 13951265766 | Evolutionary Novelty | Complex structures evolved in increments from simpler prototypes in other species | 17 | |
| 13951265767 | Exaption | An existing structure that is co-opted after having previously served a different function |  | 18 |
| 13951265768 | Heterochrony | Evolutionary change in the rate of development events; this can result in a change in the overall appearance of a species. |  | 19 |
| 13951265769 | Paedomorphosis | Sexual maturity is accelerated |  | 20 |
| 13951265770 | Biological Species | Species defined by being to produce viable fertile offspring in nature | 21 |
