state the two significant identifying features of the following
a)patyhelminthes
b)nematodes
c)annelida
d)arthropoda
Answers
Answer:
platyhelminthes:
They are triploblastic, acoelomate, and bilaterally symmetrical.
They may be free-living or parasites.
The body has a soft covering with or without cilia.
Their body is dorsoventrally flattened without any segments and appears like a leaf.
Nematoda:
Their body is bilaterally symmetrical and triploblastic.
They are cylindrical in shape.
They exhibit tissue level organization.
Their body has a cavity or pseudocoelom.
Annelida:
The Annelids are coelomate and triploblastic.
They exhibit organ system level organization.
Their body is segmented.
They respire through their body surface.
Nephridia are the excretory organs.
Arthropoda:
They possess an exoskeleton.
They have jointed appendages.
Their body is segmented.
They are bilaterally symmetrical.