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(1) Jellyfish first appeared on Earth nearly 700 million years ago. (2) They are older than any other fish with bones. (3) Over time, jellyfish have developed thousands of different forms. (4) Some are so small they can barely be seen. (5) Others, like the lion’s mane jelly, are larger than many sharks. (5) Some jellyfish glow in the dark, while others have incredibly beautiful colors.
Charlie wants to add a sentence to the end of his first paragraph (sentences 1-5). Which sentence should he add to introduce the central idea of his paper?
A. The body of a jellyfish is made of a jelly-like material that gives the animal its shape and the ability to float.
B. Jellyfish are funny-looking fish that look like soggy, empty sandwich bags.
C. When you go to the beach, you sometimes see jellyfish washed up on the sand.
D. Jellyfish are some of the most curious creatures on Earth, but they’re not really true fish.
D. Jellyfish are some of the most curious creatures on Earth, but they’re not really true fish.