What happens to the embryonic notochord of vertebrates, in general?A It is replaced by a bony vertebral column in all vertebrates.B It is replaced by a cartilaginous vertebral column in all vertebrates.C It persists throughout life in all vertebrates.D It is replaced by a bony or cartilaginous vertebral column.
Question
What happens to the embryonic notochord of vertebrates, in general?A It is replaced by a bony vertebral column in all vertebrates.B It is replaced by a cartilaginous vertebral column in all vertebrates.C It persists throughout life in all vertebrates.D It is replaced by a bony or cartilaginous vertebral column.
Solution
The embryonic notochord of vertebrates is generally replaced by a bony or cartilaginous vertebral column. So, the correct answer is D.
Here's a step-by-step explanation:
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The notochord is a flexible rod-shaped structure that is found in the embryonic stage of all chordates, which includes all vertebrates.
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It plays a crucial role in the development of the neural tube and the vertebral column.
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As the vertebrate embryo develops, the notochord is gradually replaced by a series of segmented structures, the vertebrae.
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These vertebrae can be either bony (as in mammals) or cartilaginous (as in sharks), depending on the species.
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Therefore, the notochord does not persist throughout life in all vertebrates, but is replaced by a vertebral column.
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