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The mass extinction at the end of the Permian period (about 250 million years ago) 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?
Ethnic Groups
Categories of people who identify with each other based on common ancestral, social, cultural, or national experiences.
Decades
Periods of ten years, often used as a measure of time to note changes, trends, or developments.
Mean IQ Scores
The average score derived from standardized intelligence testing, used as an indicator of relative intelligence across a population.
Mean IQ Score
The average score derived from a set of intelligence quotient (IQ) test results.
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