Question

Which of the following characteristic feature is unique to echinoderms?

• A. They have spiny skin
• B. They are triploblastic
• C. They are found only in marine condition
• D. They have true coelom

Answer 1

The correct option is A

They have spiny skin

All echinoderms have a spiny skin. This is one of the most important feature of these organisms and is uniform throughout the group.