skepticfaith writes:
Take invertebrates for instance
Which invertebrates are you talking about? All the animals that are not in Phylum Chordata are invertebrates.
how much 'evolutionary change' has occurred in each species - they have remained essentially the same for eons. Many species have gone extinct but the remaining haven't changed much.
I do not understand what you mean. The remaining invertebrate species (comprising the other 32 phyla) have radiated into millions of species alive today. Very few, if any, resembling the original founding species of the various phyla.
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