Answer the following question given this paragraph: Sponges are a source of food for many species of fish. Because sponges are anchored to a reef or rock, they can't run away from predators. However, their sharp spicules provide some defense. They also produce toxins that may poison predators that try to eat them. Q: Where are sponges most likely anchored to? Choices: - sea floor - sand - beaches - reef or rock A:
The answer to this question is:
reef or rock