Question

question 75
which of the following best describes mollusks?
○ they have radial body symmetry and a soft body sometimes covered with a shell.
○ they have radial body symmetry and a soft body always covered with a shell.
○ they are bilaterally symmetrical and have a soft body sometimes covered with a shell.
○ they are bilaterally symmetrical and have a soft body always covered with a shell.

Explanation:

Mollusks are bilaterally symmetrical animals. While many mollusks have a shell (e.g., snails, clams), some do not (e.g., octopuses, slugs). So, the description should include bilateral symmetry and the fact that the soft body is sometimes covered with a shell.

Answer:

They are bilaterally symmetrical and have a soft body sometimes covered with a shell.