"Mesotherms could be outcompeted for prey by similarly sized endotherms in similar niches. Mesotherms may also require more energy compared to ectotherms, which would put them at a competitive disadvantage if energy was a limiting factor for growth."
Scientists believe the Devonian mass extinction was caused by asteroids, anoxia, tectonic movement, and climate change.
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Minerals containing metals do often have a shiny luster
