Which of the following is NOT a characteristic of Chordates?

Notochord absent

The correct answer is Option (3)- Notochord absent

Notochord absent is NOT a characteristic of Chordates.

Explanation:

• Chordates are characterized by several features, and one of the key characteristics is the presence of a notochord.
• The notochord is a flexible rod-like structure that provides support and is present in the embryonic stage of all chordates.
• The notochord is typically replaced by the vertebral column in vertebrates.

So, the correct answer is Notochord absent.