Quincy and Leon are comparing sponges and cnidarians. Quincy says that spicules in sponges are similar to stinging cells in cnidarians. Leon disagrees.

Spicules are sharp structures that support a sponge’s body and can also help deter predators. Cnidarians’ stinging cells can protect them from predators as well as help capture prey. So Quincy is right that both can serve a protective role; spicules do not sting prey, making D incorrect.

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