coral reefs - beautiful underwater structures made of tiny animals called coral polyps - they're like the rainforests of the ocean!, coral polyps - tiny animals that build coral reefs by sticking together and making hard skeletons, ecosystems - places where living things, like plants and animals, interact with each other and their environment, like a forest or a pond, culprits - the people, animals, or things responsible for causing a problem or trouble, overfishing - when people catch too many fish from the ocean, leaving not enough for the fish populations to recover, climate change - The long-term change in Earth's climate, like it getting warmer or cooler, often caused by human activities like burning fossil fuels., pollution - harmful substances that get into the air, water, or soil and can make living things sick,

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