Give the reason why Arthropoda constitute the largest group of the animal kingdom.
Arthropoda constitutes the largest group of the animal kingdom: - (i) Have an organ level of organization. (ii) Bilaterally symmetrical, segmented, triploblastic, coelomate animals. (iii) Body enclosed by the chitinous cuticle. (iv) They have jointed appendages. (v) Trachea or book gills for respiration.
