Temporal Isolation - Two species of frogs inhabit the same area, but one reproduces from January to March, whereas the other reproduces from March to May, Behavioral Isolation - Two different species of birds have different mating calls so they cannot recognize each other as mates, Gametic Isolation - If gametes of red and purple sea urchins do not fuse, there will be no zygote produced., Mechanical Isolation - In plants, certain structures aimed to attract one type of pollinator simultaneously prevent a different pollinator from accessing the pollen., Habitat Isolation - Garter snakes that live in water and one on land cannot mate although they live in the same geographic area., Hybrid Inviability - The hybrid embryos of sheep and goats, for example, die in the early developmental stages before birth., Hybrid Infertility - Mules are produced by mating a horse and a donkey, but mules are sterile and cannot breed., Hybrid Breakdown - Although some strains of cultivated rice can be cross-mated, after a few generations, sterile offspring are created.,

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