After the late Devonian extinction, the ecological gap vacated by early fishes was filled by sharks.
Devonian Extinction is the extinction that began around 380 million years ago through the segment of geologic time known as the Devonian period. The Devonian is a part of the Paleozoic era, known as the Age of Fishes, as it spawned a remarkable variety of fish.
Ecological gaps mean species diversity in terms of their ecological roles and species' ecological and geographical status. Therefore, while the species or ecosystem occurs in the protected area system, the occurrence is either of inadequate environmental conditions or the protected area that fails to address species.
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