Question

What is the difference between Phylum Nematoda and Phylum Annelida. in the general sense of characteristics.

Answer 1

Animals belonging to Phylum Nematoda do not have real organs. They have tissue level of organization. They do not have true body cavity in which well developed organs can be accomodated. False body cavity or pseudocoelom is present. They are parasitic animals.

Animals belonging to Phylum Annelida are bilaterally symmetrical, and their body is segmented. They have true coelom. They may be free-living or parasitic.