[Campbell Biology P.765] The concept heading for Lophotrochozoans states they are 'a clade i... | Practice Question

The concept heading for Lophotrochozoans states they are 'a clade identified by molecular data.' Based on this, which statement about the unity of this clade is most accurate?

  • A: All members share a unique, easily identifiable morphological feature.
  • B: Their unity is primarily based on genetic and molecular analyses, not obvious shared physical traits.
  • C: They all possess a coelom and a segmented body.
  • D: They are defined by their ability to undergo ecdysis (molting).

Explanation

The concept heading for Lophotrochozoans explicitly states 'a clade identified by molecular data'. This directly implies that their grouping is based on genetic evidence rather than universally shared, obvious morphological traits, which is further hinted at by the accompanying question asking if they are united by unique morphological features.