Which statement about jellyfish is true?

Which statement about jellyfish is true?

• A. They have a rigid internal skeleton
• B. They drift through the ocean and capture prey with tentacles
• C. They are vertebrates
• D. They build reefs

Answer: (B)

Jellyfish are soft-bodied marine animals with no rigid internal skeleton. Their bodies are mostly water and a gelatinous material, and they move by pulsating their bell while often drifting with ocean currents. They trap prey using tentacles that carry cnidocytes, specialized cells with stinging structures (nematocysts) to immobilize and capture prey. This combination—no internal skeleton, invertebrate body plan, drift-like movement, and tentacle-based prey capture—is what makes the statement true. They are not vertebrates, and reef building is done by corals and some other organisms, not jellyfish.