According to most biologists, the egg came first. The oldest fossils of dinosaur eggs and embryos are around 190 million years old, while the oldest generally accepted bird fossils are around 150 million years old. This means that eggs generally existed before chickens. 

The first amniotic eggs, which are hard-shelled eggs that can be laid on land, appeared around 312 million years ago. The first chickens evolved around 58,000 years ago at the earliest. 

However, some say that the question is a classic causality dilemma, and that attempting to identify the answer is futile. As Luna Lovegood from Harry Potter said when asked the riddle, “A circle has no beginning”

The chicken or the egg dilemma is a causality dilemma that describes a situation where it’s impossible to determine which of two things existed first and which caused the other. The dilemma is based on the observation that all chickens hatch from eggs and all chicken eggs are laid by chickens

Taken metaphorically, the question is a meditation on the futility of determining the cause of a self-perpetuating cycle. Taken literally, it’s a great question for evolutionary biologists

According to most biologists, the egg came first. However, in 2010, Dr. Colin Freeman from Sheffield University’s Department of Engineering Materials said that scientific proof shows the chicken came first. 

From a biological perspective, the egg came first because the genetic mutations that led to the first chicken would have occurred in the offspring of birds that were not quite chickens. 

Birds evolved from reptiles, so the first bird hatched from an egg that was laid by a reptile that was very similar to, but not quite, a bird itself

Some say the chicken came first because the formation of egg shells requires a protein found only in a chicken’s ovaries. This protein, called ovocleidin-17 (OC-17), is necessary for the formation of chicken eggs. 

Some also say that the chicken came first because the chicken produces the egg, and the egg is where the chicken came from. 

According to sacred Islamic books, the hen existed first. These books teach that animals were created at the beginning of the world, so the hen did not come from the egg but from nothing

The phrase “chicken and egg” is also used as a metaphor to describe a situation where it’s difficult to determine which of two events is the cause and which is the effect. It can also be used to describe a scenario of infinite regress, or the difficulty of sequencing actions where each seems to depend on others

For example, in marketplaces, the chicken and egg problem refers to the challenge of attracting both buyers and sellers to the platform. The problem arises because buyers won’t use the marketplace if there aren’t enough products or services available, and sellers won’t join if there aren’t enough buyers

According to most biologists, the egg came first.  Eggs are female sex cells that evolved between 1 and 2 billion years ago, before our ancestors adapted to life on land.  Amniotic eggs, which are hard-shelled eggs that can be laid on land, appeared around 312 million years ago.  The first chickens evolved around 58,000 years ago at the earliest. 

According to creationists, God created mature birds with the ability to reproduce on Day Five of Creation Week. However, this doesn’t address the specific question about domesticated chickens

Here are some reasons why the egg came first: 

• Eggs are female sex cells All sexually reproducing species produce eggs. 
• Amniotic eggs are a game changer Amniotic eggs are hard-shelled eggs that can be laid on land. They appeared around 312 million years ago, while the first chickens evolved around 58,000 years ago. 
• Zygote cells house DNA mutations DNA mutations can only occur in zygote cells, which are housed in the chicken’s egg. 
• Eggs were around a long time before chickens Dinosaurs, fish, and other creatures laid eggs millions of years before chickens evolved. 
• Eggs were a huge evolutionary innovation Eggs may have saved amniotes from extinction and allowed them to invade dry land.

Finally, scientists are becoming more confident in revealing the answer based on a study around amphibians and lizards. A new study, on the verge of answering this question, suggests that the earliest ancestors of modern-day reptiles, birds, and mammals may have given birth to live young instead of laying eggs

If the question refers to eggs in general, the egg came first. The first amniote egg—that is, a hard-shelled egg that could be laid on land, rather than remaining in water like the eggs of fish or amphibians—appeared around 312 million years ago

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