याद रखने योग्य अवधारणाएँ और फॉर्मूला
Phylum Annelida:
• Annelids are segmented worms with a well-defined body plan.
• Examples include earthworms, leeches, and marine polychaetes.
• They exhibit metamerism, meaning their bodies are divided into segments.
• They have a closed circulatory system with a specialized structure called a dorsal blood vessel.
• Study their respiratory system, which may involve gills, skin respiration, or parapodia.
• Understand their digestive system, which includes a muscular pharynx and a straight digestive tract.
