Question

S. In terms of animal diversity, which of the following clades contain the greatest number of animal species? circle your answer below and explain your answer. [6 pts a. the vertebrates b. the bilaterians c. the sponges d. the deuterostomes e. the insects

Answer 1

B. bilaterians

Bilateria shows bilateral symmetry. A single middle axis divides body into two equal and mirror halves. They have anterior and posterior as well as dorsal and ventral body symmetry. Insects, crustaceans, sanils, mussels, frog, human, bird and fishes all are part of the group bilateria. Triplobastic embryos of bilaterians divided into ectoderms, endoderm and mesoderm. Thriploderms divided into different cell types and makes different organs for specific function (in different animals).