In early marine ecosystems, what status did sharks hold regarding vertebrate evolution?
Answer
Earliest true vertebrates
Sharks occupy a foundational position in the timeline of vertebrate evolution. The general shark group established itself very early in the development of marine ecosystems, representing some of the very first forms of true vertebrates to appear in the fossil record. This ancient origin signifies that the cartilaginous fish lineage developed fundamental vertebrate characteristics long before many other major groups, including the dinosaurs that appeared much later, were present. Their existence over 450 million years ago confirms their status as pioneers among vertebrates in the world's oceans.
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