Which of these, if true, would support the claim that the ancestral cnidarians had bilateral symmetry? 1.Cnidarian larvae possess anterior-posterior, left-right, and dorsal-ventral aspects. 2.Cnidarians have fewer Hox genes than bilaterians. 3.All extant cnidarians, including Nematostella, are diploblastic. 4.β-catenin turns out to be essential for gastrulation in all animals in which it occurs. 5.All cnidarians are acoelomate.

Animal diversity is the variety of animals that have resulted from adaptations and modifications to their internal and external morphology, shape, size, and behavior.