[Campbell Biology P.735] Which of the following statements about the simplified phylogeny of... | Practice Question

Which of the following statements about the simplified phylogeny of animals, as presented on the page, is correct?

  • A: All Eumetazoans possess bilateral symmetry.
  • B: Deuterostomia is a sub-group within Bilateria.
  • C: Animals with tissues include Porifera.
  • D: Lophotrochozoa and Ecdysozoa are the only invertebrate groups.

Explanation

The phylogenetic tree illustrates that 'Bilateria' is a major clade, and 'Deuterostomia' branches off from within Bilateria, indicating it is a sub-group. Eumetazoa includes Cnidaria which are radially symmetrical. Porifera are explicitly mentioned as lacking tissues. Finally, Porifera and Cnidaria are also invertebrate groups, not just Lophotrochozoa and Ecdysozoa.