The differences in IQ can be explained by other factors other than genetic. e.g: - dietary iodine affects your IQ positively - exposure to lead (e.g: leaded

The differences in IQ can be explained by other factors other than genetic. e.g: - dietary iodine affects your IQ positively - exposure to lead (e.g: leaded fuel emissions), arsenic (e.g: from water) and pollution at a large affects your IQ negatively