What substance is secreted from the mantle? 2. What is the older part of a clam’s shell? 3. Why are clams called bivalves? 4. Name the two muscles responsible for keeping the bivalves closed. 5. Does the clam have an open or closed circulatory system? What is the name of the fluid that flows through the circulatory system? 6. Give the kingdom, phylum, and class for the clam 7. What is meant by the term “filter feeding”? How do clams filter feed? 8. What structures are found inside the visceral mass? What does the word “viscera” mean? 9. What do the rings on the clam’s shell indicate? 10. Where are the incurrent & excurrent apertures located and what is their function?

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