Does it matter if intelligence is a "single trait"? IQ, at least, is a single trait and it's empirically heritable. There has been a great deal of work to addre

Does it matter if intelligence is a "single trait"? IQ, at least, is a single trait and it's empirically heritable. There has been a great deal of work to address the confounders (e.g. twin and adoption studies) and shore up the construct validity of IQ. Nobody thinks IQ = intelligence, but it's a measurable trait that says a lot about intelligence. IQ isn't on the same level of definiteness as height, but I don't think you have a bright line of "trait validity" with height on one side and IQ on the other.