What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
The phylum, Arthropoda, consists of more than two-thirds of the animal species on earth. The reasons for the success of arthropods are as follows.
(i) Jointed legs that allow more mobility on land.
(ii) Hard exoskeleton made of chitin that protects the body from the harsh conditions.
(iii) The hard exoskeleton also reduces water loss from the body making them more adapted to terrestrial conditions.
(iv) The fertilisation is internal which provides protection to the progeny from the external harsh conditions.
What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
What is the difference between direct and indirect development?
Distinguish between intracellular and extracellular digestion?
What are the peculiar features that you find in parasitic platyhelminthes?
