Question

Invertebrates are characterised by

• A. Absence of a true coelom
• B. Absence of endoskeleton
• C. Absence of pharyngeal gill slits
• D. Dorsally or laterally placed heart

Answer 1

The correct option is B Absence of endoskeleton

Invertebrates are animal species that neither possess nor develop a vertebral column, derived from the notochord. The invertebrates don't possess an endoskeleton.
Thus, the correct answer is option B.