Mollusks

Phylums: Mollusks

Some species of mollusks, like the chambered nautilus, have changed little from their ancestors. Mollusks date back more than 500 million years ago. Many of the species became extinct about 65 million years ago.
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Most Common Mollusks
Mollusk Song: http://www1.teachertube.com/viewVideo.php?title=Mollusk_Song&video_id=124723&vpkey=