In hybrid zones where reinforcement is occurring, you should see a decline in

gene flow between distinct gene pools

Explanation:

In ecological studies, a hybrid zone can be described as an area in which mating occurs between organisms of two closely related species. As a result, viable offspring are produced. When reinforcement occurs, we will see that a decline in gene flow between organisms of these species will be seen. The organisms which are only closely related will be able to reproduce to produce viable offsprings. In a stable hybrid zone, continued production of hybrids will take place.

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igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.