in-a-tube-within-a-tube-structure-inside-animal-bodies-the-first-tube-refers-to-

Question

The term "tube within a tube" is used for roundworms and annelids  because:

Accepted Answer

Both a and b

Answer

They have a tubular digestive system

Answer

They have a tube-like body with both ends pointed

Answer

They have tubes inside their tubular digestive system