Question Detail
Question
The broad classification of the animal kingdom into Non-Chordata and Chordata is based on the presence or absence of which structure?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Chordates are defined by the presence of a notochord, while non-chordates lack it. Choice A is incorrect because only a sub-group of chordates (vertebrates) have a vertebral column.
Hint
It is the primitive skeletal rod.