21. What is the phylum of animals that includes snails, slugs, and clams?
a) Porifera
b) Mollusca
c) Arthropoda
d) Echinodermata
Answer: b) Mollusca
22. What is the body plan of an octopus?
a) Bilateral symmetry
b) Radial symmetry
c) Asymmetrical
d) Spherical
Answer: a) Bilateral symmetry
23. How do cnidarians capture their prey?
a) By hunting on land
b) By using their stinging cells
c) By camouflage
d) By producing toxins
Answer: b) By using their stinging cells
24. Which of the following is a characteristic of flatworms?
a) They have a hard exoskeleton
b) They have segmented bodies
c) They have jointed appendages
d) They are hermaphrodites
Answer: d) They are hermaphrodites
25. How many legs do crustaceans typically have?
a) 4
b) 6
c) 8
d) 10
Answer: c) 8
