Hawthorn maggot flies that breed on native hawthorns and those that breed on introduced european apples can mate in the lab, but rarely mate in the wild. the inability to breed in the wild is an example of reproductive isolation.

prezygotic

Explanation:

According to my research on the maggot flies breeding process, I can say that based on the information provided within the question the inability to breed in the wild is an example of prezygotic reproductive isolation. Like mentioned in the question this is basically any kind of mechanism that prevents fertilization from occurring.

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its like this, "if i give a plant an unlimited amount of sunlight,then the plant will grow to its largest possible size."

hope it let me know if it does or doesn't =^-^=