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which of the following are examples of postzygotic reproductive isolation?

which of the following are examples of postzygotic reproductive isolation?
A. two species of yucca plants can pollinate each others' seeds, but the seeds are then aborted.
B. two frog species meet and can mate with each other, but the hybrid offspring are infertile.

the right answer is A, but i couldn't figure out why B are not right answer also, according to the principle of postzygotic isolation. thanks

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Biology- 8097828.doc

Which of the following are examples of post-zygotic reproductive isolation:
A. Two species of yucca plants can pollinate each others' seeds, but the seeds are then aborted.
B. Two frog species meet...

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