What characteristic is responsible for the branching off of the roundworms from earlier animals?
pseudocoelomate body plan
What type of digestive system is seen in these animals?
alimentary canal
What level of organization do these organisms demonstrate?
organ-system level
How many tissue layers do these organisms have?
triploblastic
When do they show up in the evolutionary history?
Precambrian
Type of excretory system?
Waste exits the excretory pores
Why is it considered a "false cavity"?
It is not lined with mesoderm
Where are they found?
worldwide
What phylum is it in and what is the common name?
phylum: Nematoda
roundworms
A. cuticle
B. epidermis
C. pseudoocoel
D. longitudinal muscles
E. dorsal nerve cord
F. ventral nerve cord
G. intestines