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Post anal tail is present in chordates at some stage in the life.

1. a) True for all chordates
2. b) True for vertebrates only
3. c) True for invertebrates only
4. d) True for some chordates

Correct answer: a) True for all chordates

Solution

A post-anal tail is one of the key chordate characteristics and is present at least during embryonic or larval stages in all chordates. It may be reduced or lost in adults, but its presence at some stage makes the statement true for all chordates.

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