The remaining animals, the great vast majority—comprising some 29 phyla and more than a million species—form the Bilateria clade, that have a bilaterally symmetric body program. The Bilateria are triploblastic, with a few well-produced germ levels, and their tissues type distinctive organs. The digestive chamber has two openings, a mouth https://digibookmarks.com/story20239351/a-secret-weapon-for-cheap-pet-food