Question

The two more distantly related phyla are

• A. Cnidaria and Platyhelminthes
• B. Annelida and Arthropoda
• C. Chordata and Echinodermata
• D. Mollusca and Echinodermata.

Answer 1

The correct option is B Annelida and Arthropoda

Arthropodes advance over Annelids in having;

1. Distinct head in all species.

2. Jointed appendages.

3. Striped muscles arranged in bundles for moving particular parts.

4. Jointed exoskeleton for protection and muscle attachment.

5. Special respiratory organs, such as gills, tracheae, book lungs.

6. Well developed sense organs such as compound eyes, statocyst, auditory organs, taste receptors.

7. Endocrine glands and pheromone secretion for communication.

So, the correct answer is 'Annelida and Arthropoda'.