I'd say the egg, because eggs evolved long before chickens did
Yeah I agree, The egg would have been the first sign of there being a chicken. It would have hatched and this bird would have been different to the other birds. The chicken is also an adult which is imposibble to be first therefore it must be the egg.
Simple evolutionary logic would suggest that for the present day chicken to exist, it must have been laid in an egg. Whether that egg was laid by the same, one step back in evolving chicken, is irrelavent - the benchmark being the 'present day chicken,' it was the egg from which it was laid that came first.
Presuming of course, that the chicken's ancestors laid eggs...
Fair play, but what if I altered the question to what came first: the Dinosaur or the Dinosaur Egg?
Need a definition of a dinosaur (as that's an ENORMOUS group of species of varying relations and many reptiles found in the time period are not actually dinosaurs). Defining a species we have today is difficult let alone one that has been dead tens of millions of years.
Simple evolutionary logic would suggest that for the present day chicken to exist, it must have been laid in an egg. Whether that egg was laid by the same, one step back in evolving chicken, is irrelavent - the benchmark being the 'present day chicken,' it was the egg from which it was laid that came first.
Presuming of course, that the chicken's ancestors laid eggs...
What if the question were altered to what came first, the chicken or the chicken egg? Assuming the chicken had evolved from another ancestor/bird and had mutated over generations into what we call a chicken, would said chicken have been born in (1) a chicken egg or (2) an ancestor species egg? in the 1st instance the egg comes first, but in the second the chicken comes first.