A) Chordata
B) Arthropoda
C) Protozoa
D) Annelida
Correct Answer: B
Solution :
Phylum Arthropoda is the largest phylum of animal kingdom including about 900,000 species in all habitats which constitute about 80% of all the known species of animals. It is characterised by triplobiastic, hemocoelomic segmented, invertebrates having chitinous exoskeleton, jointed appendages and jointed legs. Class insecta has 750,00 species. Phylum Annelida includes elongated bilaterally symmetrical, and highly organized animals in which the organs have grouped in to systems. They are the first animals to have a closed vascular system. Phylum Protozoa contains microscopic and unicellular animalcules without tissue and organs. Phylum Chordata is the largest of deutrostome phyla and comprises a variety of living and extinct animals.
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