NEET BIOLOGY

Detailed explanation-1: -Triploblastic animals have three germ layers and have a larger diversity of body plans compared with diploblastic organisms because of the additional mesoderm layer. The majority of them are bilaterally symmetrical.

Detailed explanation-2: -Bilateral symmetry is characteristic of the vast majority of animals, including insects, fishes, amphibians, reptiles, birds, mammals, and most crustaceans.

Detailed explanation-3: -Animals with bilateral symmetry develop three germ layers: an inner layer (endoderm), an outer layer (ectoderm), and a middle layer (mesoderm). Animals with three germ layers are called triploblasts. Figure 4: During embryogenesis, diploblasts develop two embryonic germ layers: an ectoderm and an endoderm.

Detailed explanation-4: -Arthropoda are also bilaterally symmetrical and triploblastic animals.