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Q: Over two-thirds of all named species on earth are _____.
  • A. Porifera
  • B. Arthropoda
  • C. Aschelminthes
  • D. Ctenophora
Correct Answer: Option B - Actually Arthropoda is the largest phylum, in animal kingdom, which includes such familiar forms as lobsters, crabs, spiders, mites, insects, centipedes and millipedes. About 84% of all known species of animals are members of this phylum. The phylum arthropoda is commonly divided into four subphyla of extant forms Chelicerata (arachnids), Crustacea (Crustaceans), Hexapoda (Insects and Spring tails) and Myriapoda (Millipedes and Centipedes).
B. Actually Arthropoda is the largest phylum, in animal kingdom, which includes such familiar forms as lobsters, crabs, spiders, mites, insects, centipedes and millipedes. About 84% of all known species of animals are members of this phylum. The phylum arthropoda is commonly divided into four subphyla of extant forms Chelicerata (arachnids), Crustacea (Crustaceans), Hexapoda (Insects and Spring tails) and Myriapoda (Millipedes and Centipedes).

Explanations:

Actually Arthropoda is the largest phylum, in animal kingdom, which includes such familiar forms as lobsters, crabs, spiders, mites, insects, centipedes and millipedes. About 84% of all known species of animals are members of this phylum. The phylum arthropoda is commonly divided into four subphyla of extant forms Chelicerata (arachnids), Crustacea (Crustaceans), Hexapoda (Insects and Spring tails) and Myriapoda (Millipedes and Centipedes).