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Identify the largest phylum of Animalia — accounting for over TWO-THIRDS of all named species on Earth.
AMollusca
BEchinodermata
CChordata
DArthropoda — chitinous exoskeleton, jointed appendages, open circulation, malpighian tubules for excretion
Answer & Solution
Correct answer: D. Arthropoda — chitinous exoskeleton, jointed appendages, open circulation, malpighian tubules for excretion
Arthropoda is the largest phylum — insects, spiders, crustaceans. Body covered by chitinous exoskeleton; jointed appendages; head, thorax, abdomen; respiration via gills/book gills/book lungs/tracheal system; excretion by malpighian tubules. Mollusca is the second largest.
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