One species of plant produces flowers when nights are 10 hours long. A related species comes into flower when nights are 9 hours long. This is an example of

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This is an example of temporal isolation, where two species do not interbreed because they have different times of reproduction. In this case, the two species have different requirements for the length of the night to trigger flowering. Gamete, mechanical, and behavioral isolation refer to different mechanisms that prevent interbreeding between species.

One Species of Plant Produces Flowers When Nights Are 10