According to Cattell and Horn's theory of intelligence, which type of intelligence is thought to reflect the more basic, physiologically based type of ability?

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According to Cattell and Horn's theory of intelligence, fluid intelligence is believed to reflect the more basic, physiologically based type of ability. It involves the ability to reason, solve novel problems, and understand complex ideas, regardless of one's educational or cultural background. In contrast, crystallized intelligence involves knowledge, skills, and abilities acquired through experience and education, such as vocabulary, general knowledge, and specific skills.

According to Cattell and Horn's Theory of Intelligence, Which Type