The first fish-like vertebrates in existence 500 myr ago showed all of the following fossil evidence EXCEPT

Name: The first fish-like vertebrates in existence 500 myr ago showed all of the following fossil evidence EXCEPT
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The first fish-like vertebrates, which appeared around 500 million years ago, did not have jaws. Jaws evolved later in the vertebrate lineage. The earliest fish-like vertebrates had brains, eyes, and organs of smell, which are evident from fossil records.

The First Fish-Like Vertebrates in Existence 500 Myr Ago Showed