Question

select all that apply
select all the features of mollusks.
terrestrial and aquatic species
mantle
proglottids
three germ layers
radial symmetry
deuterostome development

Explanation:

• Mollusks have both terrestrial (e.g., snails) and aquatic (e.g., clams, octopuses) species.
• The mantle is a key characteristic structure in mollusks (secretes shell in many species).
• Three germ - layers (ectoderm, mesoderm, endoderm) are present as mollusks are triploblastic.
• Proglottids are segments in tapeworms (Platyhelminthes), not mollusks.
• Mollusks have bilateral symmetry, not radial symmetry (radial symmetry is in e.g., cnidarians).
• Mollusks are protostomes (not deuterostomes; deuterostomes include e.g., chordates).

Answer:

terrestrial and aquatic species, mantle, three germ layers