Adaptive radiation is common following a period of mass...

Adaptive radiation is common following a period of mass extinction, probably because (a) the survivors of a mass extinction are remarkably well adapted to their environment (b) the unchang. ing environment following a mass extinction drives the evolutionary process (c) many adaptive zones are empty (d) many ecological niches are filled (e) the environment induces changes in the timing of development for many species

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Key Concepts

Adaptive Radiation

Adaptive radiation is the rapid evolution of diversely adapted species from a common ancestor when new environmental opportunities arise. This process occurs when species exploit different ecological niches, leading to a wide variety of forms and functions that allow them to survive in different environmental conditions.

Mass Extinction

Mass extinction refers to a rapid decrease in the number of species due to catastrophic events, which significantly reduces biodiversity. Following such events, the disappearance of numerous species creates opportunities for the survivors to radiate and fill the vacant ecological niches and adaptive zones.

Ecological Niches and Adaptive Zones

Ecological niches and adaptive zones are specific roles or ways in which species interact with their environment. When mass extinctions occur, many of these niches become unoccupied, providing the surviving species with opportunities to exploit these vacancies. This availability promotes diversification through adaptive radiation, as different species adapt to use these now free resources and habitats.

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