According to the passage, it is believed that the largest extinction of a species occurred . A. 26 million years ago B. 250 million years ago C. 225 million years ago D. 65 mil
According to the passage, it is believed that the largest extinction of a species occurred _______.
A. 26 million years ago
B. 250 million years ago
C. 225 million years ago
D. 65 million years ago