<Table> Short scenario <Tr> <Td> ⇨ proto chicken </Td> <Td> ⇨ </Td> <Td> ⇨ chicken </Td> </Tr> <Tr> <Td> ↓ (mutation) </Td> <Td> ↓ </Td> </Tr> <Tr> <Td> chicken egg ⇨ </Td> <Td> chicken egg ⇨ </Td> </Tr> </Table> <Tr> <Td> ⇨ proto chicken </Td> <Td> ⇨ </Td> <Td> ⇨ chicken </Td> </Tr> <Tr> <Td> ↓ (mutation) </Td> <Td> ↓ </Td> </Tr> <Tr> <Td> chicken egg ⇨ </Td> <Td> chicken egg ⇨ </Td> </Tr>

Who came first the chicken or the egg