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2007-10-28 21:39:19 · 9 answers · asked by Anonymous in Science & Mathematics Biology

9 answers

If your ideology is scientific based the hen evolved to have eggs.If it's divine intervention then you could say its the egg?
Hence the conflict of religion verses science.I prefer to see it as God providing the means to nature to have the ability to evolve.

2007-10-29 02:47:35 · answer #1 · answered by Rio 6 · 0 0

We'd have to take it back hundreds of millions of years. In this case, the 'hen' would be a simple multicellular organism. It reproduces by splitting in two.

Two half-sized organisms are vulnerable, though, so nature gradually selects for those who don't produce offspring that are the same size. In other words, if an organism splits into one tiny organism (offspring), and one near-normal sized one (parent), the parent remains stronger and more able to survive. Furthermore, the system is no longer limited to one offspring/one parent, and thus the more familiar method of reproduction is born (one large parent, many small offspring).

As organisms become more complex over a few million years, it is no longer possible for offspring to 'bud' off of parents, so they require their own little self-contained area to develop in. This would evolve over a long time, perhaps starting with a mutation that would cause the offspring to bud off prematurely or while somehow encased in the cells of the parent (we're still talking really simple organisms, along the line of hydra and jellyfish). This mutation would be favorable, since it would allow the offspring to better survive, and would be passed on to its offspring, and so on. Thus the primitive egg is born.

Let's say, further down the line (now at the level of complexity of, say, a fish). Eggs have been further refined through selection to be little self-contained jelly-like environments where the offspring can develop (similar to frog eggs). A parent gets a mutation that causes excess calcification. It's not an uncommon mutation. It still happens in humans occasionally, especially with scar tissue or kidney stones. This time, the excess calcium builds up around the egg, and you get an egg similar to the kind that we see today. It imparts a small benefit to the eggs, but then a dry season comes along. The pond dries up for a few days, and the calcified eggs are able to retain their moisture. The rain comes back, and the pond refills, and the only eggs that are still viable are the calcified ones. These offspring survive and pass on the mutation, and since it is such an advantage, eggs with a calcified shell become the norm.

Evolution continues, as it always does, and through millions of years of baby steps, dinosaurs, the fish give rise to amphibians, which give rise to reptiles and dinosaurs, which give rise to birds. The egg is so effective that the trait remains in the population.

The 'hen' came first, if only metaphorically. The first animal to produce an egg came long before hens were around. As for the chickens themselves, the progression from reptile to bird to chicken is so gradual, it can't really be said that one came before the other.

2007-10-29 06:49:51 · answer #2 · answered by andymanec 7 · 0 0

The hen obviously came first. It would have been the final leap in the chain from live birth to egg layer.

2007-10-28 21:47:49 · answer #3 · answered by Peter H 3 · 0 0

biologically speaking the egg must have been first.
in a philosophical kind of view it's none or both: the hen contains the egg and the egg contains the future hen. so it's regressus ad infinitum.
don't get complicated unless you have to :)

2007-10-28 22:03:45 · answer #4 · answered by Tea A 2 · 0 0

The cock must have came first in order to fertilize the egg !!

2007-10-28 21:43:52 · answer #5 · answered by Emma B 3 · 0 1

scientist said egg is first came

2007-10-28 21:42:38 · answer #6 · answered by vep 4 · 0 0

It must be egg

2007-10-29 00:58:58 · answer #7 · answered by Anonymous · 0 0

this is the question with no definite answer.well, for me because i am a Christian, i believe that something is made by a creator. so in this case, God would have made chicken first!so it could care for the chickies!=D

2007-10-28 21:43:59 · answer #8 · answered by Maverick 2 · 0 0

where'd the egg come from?
where'd the hen come from?

did it just APPEAR?

2007-10-28 21:43:27 · answer #9 · answered by thesubwayguy500 1 · 0 1

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