[Campbell Biology P.735] According to the 'KEY CONCEPTS' section, which statement accurately... | Practice Question

According to the 'KEY CONCEPTS' section, which statement accurately describes one of the invertebrate groups?

  • A: Sponges are chordates that lack tissues.
  • B: Cnidarians are an ancient phylum of eumetazoans.
  • C: Echinoderms are the most species-rich animal group.
  • D: Lophotrochozoans are identified solely by their specific body forms.

Explanation

Key Concept 33.2 explicitly states: 'Cnidarians are an ancient phylum of eumetazoans'. This directly matches option B. Other options contain inaccuracies based on the provided text.