The phylum Nermertea has about species. The is the long proboscis. The nemerteans are the first phylum to evolve a true system. The nemertean larva is a ciliated larva. The overall turbellarian nervous system is best a. a new organism with every molting period.
Zooids eventually detach to form a. body is dorsoventrally flattened a. gametes.
Each of the following is a flatwonn class 9. The free-swimming stage of turbellarians is the except a. Batesian stage. Which one of the following does not describe 4. Which does not describe the mode of digestion 11. Food digestion is partly extracellular.