याद रखने योग्य अवधारणाएँ और फॉर्मूला
Phylum Mollusca:
• Mollusks are soft-bodied animals with a hard external shell in many cases.
• Examples include snails, clams, squids, and octopuses.
• Understand the structure and function of the radula, a feeding organ.
• Study the different types of molluscan shells and their functions.
• Know the characteristics of cephalopods, which are highly intelligent mollusks.
• Learn about their diverse respiratory systems, including gills, lungs, or cutaneous respiration.
