First slide

Classification of Animals

Question

Both molluscs and echinoderms are

Moderate

A

radially symmetrical during the adult stage
B

radially symmetrical during the larval stage
C

bilaterally symmetrical during the adult stage
D

bilaterally symmetrical during the larval stage

Solution

The adult echinoderms are radially symmetrical, but larvae are bilaterally symmetrical. Both larvae and adults of molluscs are bilaterally symmetrical (except for adult gastropods which are asymmetrical).

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