<Table> <Tr> <Td> </Td> <Td> Look up chicken - or - egg question in Wiktionary, the free dictionary . </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Look up chicken - or - egg question in Wiktionary, the free dictionary . </Td> </Tr> <P> The chicken or the egg causality dilemma is commonly stated as "which came first: the chicken or the egg?". The dilemma stems from the observation that all chickens hatch from eggs and all chicken eggs are laid by chickens . "Chicken - and - egg" is a metaphoric adjective describing situations where it is not clear which of two events should be considered the cause and which should be considered the effect </P>

Who came first the chiken or the egg