In Cattell's theory, what type of intelligence is a biologically based quality of the neurological system and cannot be trained or taught?

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According to Cattell's theory, fluid intelligence is a biologically based quality of the neurological system and cannot be trained or taught. Verbal intelligence and performance intelligence are considered part of crystallised intelligence, which is based on learned knowledge and can be improved through education and experience.

In Cattell's Theory, What Type of Intelligence Is a Biologically