[Campbell Biology P.754] Which of the following is the defining characteristic that groups a... | Practice Question

Which of the following is the defining characteristic that groups animals into the clade Ecdysozoa?

  • A: Presence of an alimentary canal.
  • B: Development through a trochophore larva stage.
  • C: Shedding of a tough external cuticle (molting) as they grow.
  • D: Having a radial body symmetry.

Explanation

The text states that 'the clade Ecdysozoa includes animals that shed a cuticle a tough external coat as they grow. In fact, the group derives its name from this process, which is called ecdysis, or molting.' This clearly identifies molting as the defining characteristic.