Botany - Animal Kingdom Question with Solution | TestHub

The number of species in phylum Arthropoda$\left(\mathrm{A}\right)$is more than 1.3 billion because insects form the most species-rich taxonomic group (>70% of the total animals). Phylum Mollusca$\left(\mathrm{C}\right)$is the second largest phylum with approximately 90000+ species. Phylum Chordata$\left(\mathrm{B}\right)$has approximately 60,000 species, among which, half of the species are fishes.