AndromedaRXJ
Active Member
Again, as I just told him...if you go back in time to when the very first organism began to exist (however that happened), that organism looks vastly different than an elephant...so the only way to explain any species leading up to an elephant is for an elephant to come from a non-elephant.
A something can come from a non-something. But a non-something can't come from a something. Once something becomes something, it stays that something, but different variations of that something can always arise.
You already accept the former if you accept that all felines share a common ancestor because that would mean a tiger came from something that was a "non-tiger", since not all cats are tigers. And if you're gonna keep iterating that it's still a cat, well an elephant is still a mammal. It's still an amniote. It's still a tetrapod. It's still a vertebrate. It's still an Eukaryota.
Just like how a basic feline split into different cat variations such as lions, cheetahs, housecats, a basic mammalia split into different groups such as cats, dogs, primates, elephants etc... And you keep going on about looks. There's more to it than looks. As I said, despite looks, a dolphin has more in common with a cow than it does with a fish.
If you want to go back to the first microbial life, Eukaryotas split off from bacteria. Eukaryotes evolved into the majority of macroscopic organism such as plants, animals, fungi etc... all three are still eukaryotes. Animals split off into different groups; fish, arthropods, molluscs, tetrapods etc... yes "animal" is just another group. No one is proposing that an animal will evolve into a non-animal.