[Campbell Biology P.766] Which of the following combinations of phylum and description is co... | Practice Question

Which of the following combinations of phylum and description is correct?

  • A: Echinodermata—radial symmetry as a larva, coelom
  • B: Nematoda—roundworms, internal skeleton
  • C: Platyhelminthes—flatworms, gastrovascular cavity, no body cavity
  • D: Porifera—gastrovascular cavity, coelom

Explanation

Platyhelminthes, or flatworms, are characterized by their flattened bodies, the presence of a gastrovascular cavity for digestion and distribution of nutrients, and being acoelomates, meaning they lack a body cavity.