Sand dollars, sea shells, and corals are often found together at beachside shops

Question

Sand dollars, sea shells, and corals are often found together at beachside shops. What do these have in common?

All are remains of marine animals

all are examples of endoskeletons

all of the living animals that produced these are closely related

all of the animals were radially symmetrical

none of the above

All are remains of marine animals

all are examples of endoskeletons

all of the living animals that produced these are closely related

all of the animals were radially symmetrical

none of the above

Explanation / Answer

a. All are remains of marine animals

The hard skeleton of sand dollars is made of calcium carbonate (The animal actually live in this shell).

Sea shells are the exoskeletons of marine animals generally made of calcium carbonate.

Corals are the skeletons of zoophytes, made of calcium carbonate.

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