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A Fish: Life Beneath the Water
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Danwhite
63 days agoA Fish: Life Beneath the Water
A fish is a cold-blooded aquatic animal that lives in water and breathes through gills. Fish are among the oldest animals on Earth, having lived in oceans, rivers, and lakes for over 500 million years. They come in all shapes, sizes, and colors — from the tiny guppy to the massive whale shark.
Fish are divided into three main groups: bony fish, cartilaginous fish (like sharks and rays), and jawless fish (like lampreys). Most fish have scales that protect their bodies and fins that help them move. They use their gills to extract oxygen from the water and are covered in slime to reduce friction while swimming.
Fish live in nearly every body of water. Some prefer salty oceans, while others live in freshwater rivers or lakes. Certain fish, like salmon, can even move between saltwater and freshwater during their life cycle. Many fish travel in groups called schools for protection against predators.
Fish are an important part of ecosystems. They keep the water clean by eating algae, smaller fish, or insects. They also provide food for animals like birds, seals, and humans. Around the world, fish are a major source of protein and income for millions of people.
However, fish face many dangers. Overfishing, pollution, and climate change threaten fish populations. Coral reefs, which support many species, are dying due to rising sea temperatures.
Protecting fish means protecting the environment. People can help by fishing responsibly, reducing pollution, and supporting marine conservation efforts. Fish may live underwater, but they are deeply connected to the health of our entire planet.
5 Questions About the Passage
What are the three main types of fish?
How do fish breathe underwater?
Why do some fish swim in schools?
What dangers do fish face today?
How can people help protect fish and their habitats?