Rahvin writes:
Vertebrates, for example, are any animal whose spinal cord is surrounded by a backbone. This includes birds, fish, amphibians, reptiles, and mammals, each of which are defined by their own individual features that make them distinct from other subgroups of vertebrates, but each subgroup (and each of the subgroups that arise from them, and so on) is still and will always be vertebrates.
Ok great, so because science defines all creatures with a spinal cord surrounded by a backbone as a vertebre, it has to mean that all vertebres are related and decended from each other.
Why should that be the case? If God decided to create fish, they would all need to be able to breath underwater, but it doesnt imply that they must all be related for that reason. Same with land animals, just because they all breath air and walk on land does not have to mean they are all related.
the Special Theory of Evolution states that while limited
change within groups can be observed, such change always remains within phylogenetic boundaries. It was coined by Dr Kerkut in this way
There is a theory which states that many living animals can be observed over the course of time to undergo changes so that new species are formed. This can be called the Special Theory of Evolution and can be demonstrated
in certain cases by experiments
We know and understand that change occurs...anyone who liks dogs can see how new breeds can be developed. But the real question is do the changes that occur cross phylogenetic boundaries?
I dont think that just because a whole range of species have a spinal cord surrounded by a backbone proves that these all developed from long unbroken chain.