Question

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

Explanation:

• Ecdysozoa: These organisms are characterized by having a cuticle that is shed during growth (ecdysis). They do not have radial symmetry and two - germ layers as the main defining features.
• Parazoa: This group (e.g., sponges) lack true tissues. They do not have the complex body plan with two germ layers and radial symmetry as described for cnidarians.
• Lophotrochozoa: This is a diverse group that includes animals with a lophophore (a feeding structure) or a trochophore larva. They typically have bilateral symmetry (at least in some life stages) and more than two germ layers in most cases.
• Radiata: Cnidarians are part of the Radiata. Radiata are characterized by radial symmetry (in adults) and have two germ layers (ectoderm and endoderm) during embryonic development.

Answer:

Radiata