Question

Whether egg was the first to come to the earth or hen???

Answer 1

two birds that weren't reallychickens created a chicken egg, and hence, we have an answer: The eggcame first, and then it hatched achicken. Maybe the question we should be asking is: Which came first, the proto-chicken or the proto-chicken egg

Answer 2

All living beings evolve.
The dinosaurs laid eggs who were some the oldest creature on your Earth.
After the meteorite strike your Earth lost its life but the information about life was left
The meteorite brought some elements to your Earth which didn't existed in your Solar System.
This simply changed the type of life you think of.
The dinosaur of the Earth loved to live at high temperatures and this the reason their fossils are still left.
Some birds could fly and due to the mutation after the strike the size of organisms reduced and then The evolution resulted in the birth of Hen from a egg from two birds which were not chicken but were bought by the meteorite to your Earth after it destroyed the original life form of Earth.
So the humans are not the native of the Earth but aliens.
That is why humans like to discover space and go to moon and know about stars.