Why is natural selection explains the origin of the diversity of life?

2017-11-30 8:22 pm
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By definition it is a selective process (selecting from already existing information), so is not a creative process. It might explain the survival of the fittest (why certain genes benefit creatures more in certain environments), but not the arrival of the fittest (where the genes and creatures came from in the first place)?

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The death of individuals not adapted to an environment and the survival of those that are suited does not explain the origin of the traits that make an organism adapted to an environment?

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How do minor back-and-forth variations in finch beaks explain the origin of beaks or finches? How does natural selection explain evolution?

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I am looking a test that scientist have an idea and put it in a test tube without saying, "we can't know for sure but we think this." I want something put in a test and proven over and over again and not just presuming something. I thought science was to test something and if the test of that time doesn't go with the idea then that is not a good idea or I am wrong?

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I will award a best answers but you are not talking about this subject. The scientific Method. Fact= An observation of matter in specific isolated definitions.

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Hypothesis= an unverified scientific explanation relationship between facts based upon assumptions which may or may not be recognized by the scientists generating the hypothesis.

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Model= Models are representations of reality. Only the most important properties are reflected and minor or unrecognized aspects are not covered.

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Theory= Hypotheses that prove capable of explaining observation and making predictions without contradictions over period of time are referred to as "theories". A theory is accepted based on the results thru observations or experiments, which anyone can be reproduce. The scientific method must be repeatable.

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Law of Nature= If the truth of a statement is verified repeatably in a reproducible way so that it regarded as generally valid, it is considered to be a natural law.

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No one is going thru these steps

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How can life come from non-life and put that in an experiment and must be reproduced. And what experiment have shown that natural selection has added in information and not pre-existed ones which happens from a grandfather information missing their children then their children have children receiving information from the grandfather information which is not new information. What testing or test shows that nature have created new information. Why I have not seen this?

回答 (3)

2017-12-01 1:03 am
✔ 最佳答案
Because it is the mechanism for adapting to the environment. A diversity of environments means there are different ways to adapt to each one and therefore there is a diversity of organisms.
2017-11-30 10:48 pm
probabilistic change with selective removal or retention. That is the science, the predictive part. You can predict the change in population based on selective probabilities. The difficult part is not how to predict once you know the probabilities, it is judging the effects or the probabilities for a specific situation and specific life form. The values for the parameters are difficult to define. The effects of a specific probability enhancement are fairly easy to evaluate. I'm not going to teach you the math here though.

It goes without saying that a trait must alter the probability of survival and reproduction in order to cause a change, an evolution in the make-up of the population. Not all characteristics always do that. Some features have had such a large impact on likelihood that we have seen populations change in fundamental character over a matter of years in response to changes in environmental conditions.

So, it works as an explanatory and predictive tool, but the prediction side is complex and difficult to calculate. That is not the fault of the mechanism itself though.
2017-11-30 9:07 pm
Natural selection is one of the three main components needed for evolution to occur.

The three things are heredity, variation and selection. Given these three things working together in a system it is possible for evolution to happen (the change of species over time) . This is not an explanation for the origin of life, it is an explanation for the development of species over time.


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