WONDER #1250: How Are Sea Shells Formed?
Question 1 of 3
<p class=\"FreeForm\">Sea shells are the former homes of which invertebrates?</p>
Question 2 of 3
<p class=\"FreeForm\">The outer layer of a mollusk’s shell usually contains a material similar to a human being’s what?</p>
Question 3 of 3
<p class=\"FreeForm\">Which element is a primary material in most sea shells?</p>
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