[Campbell Biology P.738] Which phylum described on this page is the largest known animal gro... | Practice Question

Which phylum described on this page is the largest known animal group by number of species, characterized by a segmented exoskeleton and jointed appendages?

  • A: Nematoda (25,000 species)
  • B: Arthropoda (1,000,000 species)
  • C: Chordata (60,000 species)
  • D: Echinodermata (7,000 species)

Explanation

The Arthropoda section states: 'The vast majority of known animal species, including insects, crustaceans, and arachnids, are arthropods. All arthropods have a segmented exoskeleton and jointed appendages.' It also specifies '1,000,000 species', confirming it as the largest group described.