Permian  - lasted from 299 to 251 million years ago and was the last period of the Paleozoic Era., Triassic - geologic period which spans 50.5 million years from the end of the Permian Period 252 million years ago., Arid - having little or no rain; too dry or barren to support vegetation., Humid  - a high amount of water vapor in the air , Extinction - the death of all members of a species of plants, animals, or other organisms., Ecosystem - community of living organisms (plants, animals and microbes) in a particular area., Evolutionary - the process by which different kinds of living organism develop from earlier forms.,

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