A seashell may refer to the non-living covering of a living mollusc, or it can refer to the living mollusc itself. So it depends on the context; in any case, the seashell is or was part of a living thing.
The chemical composition of a seashell (mostly calcium carbonate) is not a living tissue, but it is connected to (and constructed by) living tissue, just as skin, hair, bones, and teeth are in mammals. When the mollusc dies, the seashell is dead material. But since it is not an organic compound, it is not broken down as other animal tissues are. Similarly in plants, the structures of coral reefs persist because they include minerals not usually broken down by detrivores.
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Sea shells are considered nonliving because they are the hardened outer layer of a marine animal, such as a mollusk. Once the animal dies, the shell is left behind as a protective structure.
The shell itself is not living, no. If the shell is inhabited then the muscle inside of it is most certainly living.
Iancelet is nonliving.
Coal is a non-living substance.
Living
what are the nonliving things and living things for a pronghorn
Trees are living things, until they die; then they are nonliving things.