question about evolution?

Question

According to the evolution theory, how many times did life start on earth? I mean, did we all start from one life form, or did more than one life form start out from lifelessness?

Answer 1

>>>>According to the evolution theory, how many times did life
>>>> start on earth?

"Evolution theory" doesn't have anything to say on the matter. Evolutionary theory is concerned solely with the diversity of life, not its origins.

Evolutionary theory is no more concerned with how many times life started than economic theory.


>>>>did we all start from one life form, or did more than one life
>>>> form start out from lifelessness?

The depends on which hypothesis of ABIOGENESIS you subscribe to. Abiogenesis is the study of the origins of life, not evolution.

Various hypotheses exist concerning abiogenisis. Most of them postulate a single development of life because all life forms today display numerous similarities that imply a single origin. However some postulate multiple origins with much swapping of material during the very earliest stages of development accounting for the similarities.

Answer 2

According to evolution theory, all life on earth now is descended from a common life form. But if situations were good for the arisal of life in several places in the world, life might have arisen in several different places at the same time. But once they encountered each other, the better kind of life form would have outcompeted the others.

Answer 3

Taxonomy presents genetic diversity in groups: Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species, with various other ranks sometimes inserted.

To “break off” evolution at a certain level (e.g. species) and thereby applying taxonomy to evolution models, makes no sense because the ranking is an artificial reflection of the existing diversity based on arbitrary defined “jumps” on the scale.
I see no reason why evolutionary mechanisms of a population genetic pool would be ruled by an artificial classification tool.

...Somewhat beside the question, but related to some of the answers. Talking about limited definitions such as “species” or indeed “life”, there is no reason why the latter could have started in various forms but with one(?) successful only. Besides, our definition of life is ambiguous (ref. prions).

Answer 4

"Evolution" has become distorted these days due to so much pseudo-scientific input. Yes, evolution is a fact. But only within the proper perimeters. Yes--our modern day tigers evolved from the early saber-toothed tigers. Yes--our modern day elephants evolved from the early Mastadons. And true--many modern day things evolved from past prototypes. The thing to remember is: All evolution remained within it's own species. Snakes didn't become squirrels, and lizards didn't become cows. Man is a separate being from that of the animals. God created man in His own likeness and image....the animals were created separately. Yes they evolved, according to what was necessary for their continued existence, but we didn't ....there was no need. We were, and are, already at the highest point of what is possible in this present life.

Answer 5

The Theory of Evolution says nothing about the origins of life.

It is only concerned with the mechanism for how species evolve, specialize, and change.

The origins of life is not a question about evolution.

So far we don't know how life began. But clearly it was not created by some magical being. You cannot explain things by invoking God.

Answer 6

Since all life uses the same DNA-RNA coding system, we presume that all life descended from a single common ancestor. If there were others, they all died out, leaving no remains, that we are aware of. This is why the search for life on Mars is so cool. What if we found life on Mars that uses a completely different system? That woud be so cool and it would tell us volumes about what life needs to exist in the first place, etc.

Answer 7

There are different theories. one says the Earth was seeded by primitive life deep in the cores of meteorite...say from a asteroid striking Mars...very hypothetical, and interesting to ponder...another is that the basic building blocks are in place throughout the universe...chemically...and that given enough time in a suitable environment, these basic protiens will combine chemically into soimething like crystals and becaus of the molecular composition, be able to reform and by unknown causes eventually become capable of reproduction...this does nor discount the hand of God, but does not count evolution out as the discription of this process.

If you've read much about it, the earth was populated by very simple life forms for about a billion years...then something happened...a shower of debis from space, radiation, comets particles...but the fact is that there was an explosion of species a billion years ago, from the fossil record it can be seen that evolution happened exponetially...flippers, mouths, and nervous systems evolved.

since there was a "soup" of primitive life at this time of very limited variety, I doubt that there were few forms that deveolped from basic protiens at that time, it was probably from a small colony that grew larger and took advantage of the environment. But, the Earth was nearly destroyed before life began by a collission that created the moon...it is possible that these simple protiens were developing then as well, then were destroyed.

From my own reading, I understand that simple microbes develop in anaeobic condition in a wide range of teperatures..they are deep in the earth and may be responsible for the collections of minerals into veins and lodes (like iron ) as a biproduct of their life functions. in different planets it is probably the norm for life to develop from simple protien crystals and grow to take advantage of an environment. These simple creatures may be very abundant in the universe...so abundant that your question is irrelevant...the key issue is the development of higher creatures like fishes and eventually mammals...that's gotta be rediculously rare...I think we developed from one can of Cambell's cream of life soup.

Answer 8

Human Evolution theory does not tell us the source or origin of the first hominids.


As many scientists say, its all a mystery.

Answer 9

Thats a good question and even for scientists, they can only give you a presumption based on limited evidence. Also, when someone says that evolution theory is wrong, please (e hem, TED) provide evidence to your claim. Ans when I say evidence, I mean something we can experimentily observe and NOT out of the Bible.

Answer 10

I think there is a genetic relationship to all known life and so it started at least once. That doesn't mean that it is known that it only developed once. Our fossil evidence is extremely fragmentary and there is know way to know how many (if any other times) life began.