JBeukema
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- #81
This particular theory has plenty of proof. Without looking it up, I'm guessing that the theory says something along the lines that a species can adapt over time to its environment.
Not quite. That the lifeforms on Earth have changed is fact. That speciation has been observed is the fact of evolution. the theory of evolution is the unifying model of how it occurs and the predictions the theory makes
Part two of the theory would be that when this adaptation does not take place, the species reduces to extinction.
That's not accurate. No such prediction is made. If a species were somehow to avoid mutation and all that comes with it (genetic drift, selective pressures..) it would only go extinct if a significant outside pressure wee applied that caused the species to no longer be successful. If no new competition showed uop and the environment wen unchanged, there is no reason the species would not continue along as it had. Indeed, some species or 'forms' seem to have changed relatively little. For instance, modern sharks and crocodiles seem to have changed very little (in phenotype) from their ancestors from millions of years ago, because they are highly successful and there are no highly selective evolutionary pressures at work. What changes are seen ()again, in phenotype) seem more consistent with genetic drift than any significant selective pressures.