HARITHA,Subject Matter Expert at Edumarz
Solution:
Phylum arthropoda forms largest group of animal kingdom.This is because of the following reasons
Presence of jointed appendages helps in movement on land
Exoskeleton formed of chitin provides protection to the body
Hard exoskeleton also prevents dehydration(Loss of water from the body)
Internal fertilization in arthropods also increase survival of progenies
Features of arthropoda
Body shows bilateral symmetry and metameric segmentation of animals.
They show organ-system level of organization
The exoskeleton is formed by thick chitinous cuticle
Body is divided into the head, thorax, and abdomen.
Digestive system is complete with presence of mouth and anus.
Presence of open circulatory system
Respiratory organs include gills,trachea,book lungs
Excretion organs are Malpighian tubules
Cilia are absent
They are dioecious
Shows internal fertilization
Development is indirect having larval stages