Which of the following is considered the key innovation that started chordates along the evolutionary path that led to vertebrates?

Question

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The key innovation that started chordates along the evolutionary path that led to vertebrates was the evolution of a flexible rod to which muscles are attached which allowed moving their backs laterally. This flexible rod is known as the notochord, and it is present in all chordates. It provides support and allows for lateral movement, which is important for swimming and other forms of locomotion. The evolution of the notochord led to the development of the vertebral column in vertebrates.

Which of the Following Is Considered the Key Innovation That