Multiple choice Which of the following is correct? Porifera and Annelida - Phyla Oligochaeta and Arthropoda - Phyla Mollusca and Hydrozoa - Classes Aves and Chordata - Classes - Reveal answer Fill a bubble to check yourself A Correct answer Explanation Both Porifera and Annelida are phyla. The common examples of the genera in Porifera are Lycon, Sycon, etc. and an example of the phylum Annelida is earthworm.