The shell is the outer skeleton of mollusks, their fortress, which they themselves build throughout their life. The mollusk grows, and its outer protection is the shell.

The shell is the outer skeleton of mollusks, their fortress, which they themselves build throughout their life. The mollusk grows, and its outer protection is the shell.

Photo by polinakolendreikina

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Stock photo: The shell is the outer skeleton of mollusks, their fortress, which they themselves build throughout their life. The mollusk grows, and its outer protection is the shell. was taken by polinakolendreikina .