Which came first on earth? A hen or an egg?

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scientifically, a hen came first on earth due to abiogenesis.

The egg, because the egg is more analogous to a single cell.

If you go back in time...hen, egg, hen, egg, hen, egg, then you are looking back in time at evolution in reverse. The hen simplifies until it's like a worm basically, then the life cycle becomes even simpler until you get to the presumed evolutionary origin of all multi-celled animals: The undifferentiated single eukaryotic cell. The egg is like a single cell with a yolk (nucleus) and other components.

Well Vivek who so ever came had DNA to replicate. So sounds more biological that egg came as it can have power to undergo pathenogenesis. So may be it did during evolution after coverings its journey from coacervate like cell. I know this question has been asked from ages but for me this sounds logical exaplanation (smiles).

if you read the creation story in the bible you will see that god created all animals then set them forth to multiply meaning the hen came first

The hen... God first created them --The Bible , Genesis 1 : 21....then God commanded them to multiply --Genesis 1:22....then the fowl started to lay eggs

for thousands of years, there was ocean life before life outside of the ocean, and for thousands of years, sea creatures were laying eggs.

so eggs had to come first. whether you believe in the bible or believe in what biology teaches, because they both have the same claims about the development of life on earth.

But to be specific about the hen species and the egg it would hatch from, or how the original hen laid the original egg vs. the original egg hatching the original hen, it would seem only logical that the hen had to come first because eggs do not hatch themselves. even if it was some other variation of "hen" you know, some type of ancestor hen (pterodactyl maybe), the hen had to come first, or rather, the ancestor of the hen. the egg layer.

oh! i got it!

lets rephrase the question: which came first, the egg layer, or the egg?

there are many mysteries in the universe, and biology isn't free from mysteries either. for example. for millions of years, there were uni-gender, non-flowering plants and no bees. then, instantly, there were opposite gender, flowering plants and bees to pollinate them.

there was no gradual change from the plants with no flowers to the plants with flowers. there was no bee that existed prior to having flowering plants. it all just happened at once. Darwin knew this, and it was surmised that the missing links, when found, might support the theory of evolution, however, Darwin found more of these anomalies and began to see the weakness of the theory...by the time he died, it is said that he, himself, did not believe that the theory of evolution was sound.