Do you really think evolution happens within an individual animal such that it could be "observed" actually changing? That's insane and has absolutely nothing to do with evolution.<quoted text>
There are always two sides to a coin:
The conclusion that the Acanthostega is a transitional form is based the "assumption" of macroevolution, and not on observational evidence of the bones in fins or fish actually changing into tetrapod limb bones.
But we don't even need to look at Acanthostega to consider "transitional" animals. ALL animals are always under environmental pressure to change and are ALWAYS "transitional". Even the one that don't appear to change much ove rdeep time are still by definition "transitional".
The insistence on "transitional fossils" is nothing more than a strawman fallacy created by creationists.
The very idea of "species" is a human categorization to make study of biology easier -- we made the word up. Animals themselves could care less how we try to divide them into discrete categories.
Look at the platypus or the walking catfish or countless other animals that don't fit neatly into our taxonomic ranking system.