Other More Atypical Kinds
A few other categories of marine animals leave remains which might be considered "seashells" in the widest possible sense of the word.
Read more about this topic: Seashell
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“To see self-sufficiency as the hallmark of maturity conveys a view of adult life that is at odds with the human condition, a view that cannot sustain the kinds of long-term commitments and involvements with other people that are necessary for raising and educating a child or for citizenship in a democratic society.”
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