The mass extinction at the end of the Permian period (about 250 mya)is thought to have killed off as many as 60 percent of the animal families.What group of animals dominated life on land at that time?

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During the end of the Permian period, reptiles had become the dominant group of animals on land, with many different types of reptiles filling various ecological niches. This is often attributed to their ability to adapt to different environments, such as living in arid or semi-arid regions, and their ability to reproduce on land. However, the cause of the mass extinction that followed is still debated, with potential factors including volcanic activity, climate change, and asteroid impact.

The Mass Extinction at the End of the Permian Period