Regarding the characteristics of Phylum Aschelminthes, choose the following statements:
A. They are often called roundworms because their body is circular in cross-section.
B. An excretory tube removes body wastes from the body cavity through the excretory pore.
C. The alimentary canal is complete with a well-developed muscular pharynx.
D. They are dioecious and often males are longer than females.
E. Fertilization is typically external, and development is always direct.
Which of the above statements are correct?