Question

multiple choice question
cnidarians are in the group ______, which is characterized by radial symmetry and two germ layers during embryonic development.
radiata
parazoa
ecdysozoa
lophotrochozoa

Explanation:

Cnidarians are simple organisms. Radial symmetry means they can be divided into similar halves around a central axis. Two germ layers (ectoderm and endoderm) are key in their embryonic development. Radiata is a group that includes such organisms. Parazoa (like sponges) lack true tissues. Ecdysozoa (e.g., arthropods) have a cuticle that is molted. Lophotrochozoa (e.g., mollusks) have different characteristics like a lophophore or trochophore larva.

Answer:

A. Radiata