A certain species of salamander was split into two populations by a wide, dry valley, and the populations?
and the populations began to diverge from each other. After a period of time, some members of the two populations began to interbreed in a hybrid zone at the southern end of the valley. Only weak reproductive barriers existed by this time, so the two populations could freely interbreed and re-establish gene flow. This outcome in a hybrid zone is known as . 1) speciation 2) reinforcement 3) fusion 4) punctuated equilibrium 5) stability

3. Fusion

Explanation:Fusion is a term used to describe the bringing together or the joining of two cells,species etc in order to mix certain characteristics or features for the creation of a single New Cell or a Single specia. It also Describes the weakening of reproductive barriers, or blockages allowing the two populations to combine to form a new specie.

The interbreeding which took place between both species of salamander through the weakened barriers is known as FUSION.

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