alt Hacker NewsBut where is the cutoff between reptile and chicken? Given how gradual it must've been, we can therefore posit that chicken's ancestors were themselves chicken. What came first, the reptile or the egg?
But where is the cutoff between reptile and chicken? Given how gradual it must've been, we can therefore posit that chicken's ancestors were themselves chicken. What came first, the reptile or the egg?
The egg.
But it looks like phylotypic animal body plans may have originated in cell aggregates before the development of the egg:
https://onlinelibrary.wiley.com/doi/epdf/10.1002/jez.b.21417