Answer: theegg

AnswerCrossword Clue
THEEGGOne answer to an age-old question
THEEGGThis probably came first
THEEGG"...chicken or ...?"
THEEGGIts relative arrival time has been questioned
THEEGG"Horton Hatches ...": Dr. Seuss
THEEGG"... and I": MacDonald
THEEGGOption for "Which came first ...?"
THEEGG"... chicken or ...?"
THEEGGIt may have come first