Assertion (A): All vertebrates are chordates but all chordates are not vertebrates. Reason (R): Notochord in vertebrates is replaced by vertebral column in adults.

Options

1. Both A and R true and R correct explanation
2. Both A and R true but R not correct explanation
3. A true but R false
4. A false but R true

Correct Answer

Both A and R true and R correct explanation

Explanation

All vertebrates have a notochord at some stage, replaced by the vertebral column; some chordates retain it throughout.

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