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Give an account on phylum Arthropoda.
 
a. The phylum Arthropoda is the smallest phyllum of the animal kingdom.
 
b. The phyllum contains . They are  symmetrical, triploblastic and  animals.
 
c. They have defined organ structure and the body is divided into head, thorax and abdomen.
 
d. Arthropods have segmented body, and each segment has a pair of jointed legs.
 
e. The exoskeleton or the outer skeleton has  which is shed periodically when the animal grows. The process of shedding and growing of exoskeleton is termed as .
 
f. The body cavity of arthropods is filled with .
 
g. Respiration in arthropods is only through gills.  
 
h. Excretion occurs through .
 
i. All arthropods are hermaphrodites.