Labels:text | screenshot | font OCR: PERMIAN PERIOD 290-248 MYA Conditions became much drier and cooler in this period. Forests of conifers replaced the giant club mosses of the Carboniferous Period. Several groups of early reptiles dominated life on Earth. They included the mammal-like pelycosaurs and therapsids. At the end of this period about 96 percent of known species became extinct.
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