Answer: theegg

AnswerCrossword Clue
THEEGG

One answer to an age-old question

THEEGG

This probably came first

THEEGG

"...chicken or ...?"

THEEGG
Its 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