Technology2 mins ago
Chicken or egg
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For more on marking an answer as the "Best Answer", please visit our FAQ.Most scientists believe that birds developed from reptiles. Since most reptiles to this day reproduce by laying eggs, it's rational to assume that the first bird-like creature came from an egg, too. It would then have laid eggs and - over millions of years, perhaps - birds as we know them slowly developed and produced different species. The present-day chicken is one of these, but - 'way back when - its great-great-grand-daddy almost certainly came from an egg.
The egg pre-dated the bird, if you believe in evolution. Of course, fundamentalist believers in the Bible will say that God created all the creatures as creatures. In that case, the bird pre-dated the egg. Take your pick!
1. if you believe in God then the chicken came first, because God created it and it appeared on the earth as a fully grown chicken. (which i don't believe by the way)
2. new species are created when there is a genetic mutation in the birth process, so, (to explain it slightly simpler) a non-chicken creature laid a mutated egg, this hatched and became a more chicken like creature which bread with another non-chicken and so on, until the chicken was created.
Environmental factors might indicate the chicken coud've come first from an already-alive-reptile. A certain species may have recieved some element from nature (radioactivity?) and litterally changed into a chicken, or to something producing chicken-like qualities, essentially overnight. And of course from there it would take much evolution to get to the chicken we know of today.
But most likely, the mutations came from biological factors, maybe produced from environmental factors, when strands of DNA in a reptile get all messed up and start forming into confused jumbles inside the egg-producing whatever of a reptile.