Question

The advancement of cnidarians over Porifera is

• A. True germ layers
• B. Muscle cells
• C. Indefinite symmetry
• D. Both A and B

Answer 1

Answer: (D)

Both A and B

Porifera have a cellular level of an organization whereas Cnidaria has tissue level of organization. Thus, they all have two germ layers as epidermis (outer) and gastrodermis (inner) with a hollow body cavity, called as gastrovascular cavity and so are true layers. They have muscle cells, which helps in locomotion. Therefore, the correct answer is option D.