Underwater Connections

Angelfish may not form friendships the way people do, but they still interact with many other organisms in their environment. This passage explores relationships such as mutualism, commensalism, and parasitism through examples involving angelfish, larger fish, parasites, coral reefs, and other marine life. Readers learn how some angelfish help clean parasites from larger fish, while in other situations one organism benefits without affecting the other. The passage also explains how parasites can harm angelfish and how the fish themselves contribute to healthier reef habitats by feeding on algae and other organisms.

This worksheet gives students valuable practice comparing different types of relationships and deciding how each organism is affected. Academic vocabulary such as mutualism, commensalism, parasitism, and ecosystem is introduced through concrete examples, which makes these ideas much easier to understand. For parents, this is the kind of passage that builds both science knowledge and higher-level reading skills because students have to compare, classify, and explain the connections they find.