g factor is key factor for for all mental ability test.g factor is responsible for performance of cognitive ability measure.according to spearman all task of intelligence test which are included verbal and mathematical test.that are influenced by g factor.
g factor helps in phychometric investigation cognitive abilities and human intelligence.
the first answer as blood needs to be oxygenated to be passes round the body then when its deoxgenated it will return to the heart to be pumped around the body again
