The standard of chicken or egg in the world, the answer is chicken first, because human beings have the concept of chicken first and then the concept of egg.

According to the investigation of scientists, about 77 million years ago, there was a carnivorous dinosaur. It built a nest to lay eggs and hatch them, but before the little dinosaur hatched, the river surged, the carnivorous dinosaur left, and dinosaur eggs grew in the nest.

With the passage of time and the evolution of species, dinosaurs gradually evolved into later birds, and chickens were a kind of birds. At that time, dinosaur eggs became eggs that people later saw.