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Fish are aquatic animals characterized by their streamlined body and scaly skin. They breathe through gills and use fins to swim in water. Fish are found in almost all aquatic environments, from freshwater rivers and lakes to saltwater oceans. They come in a wide variety of shapes, sizes, and colors, ranging from tiny minnows to large sharks. Some species of fish are edible and are consumed as a major source of protein by humans around the world. Fisheries are an important industry, providing food and livelihoods for millions of people, but overfishing and pollution have become major threats to many fish populations.

Bird refers to a diverse group of warm-blooded vertebrates characterized by feathers, beaks, wings, and the ability to lay eggs. They are found in almost every ecosystem on Earth, from the Arctic tundra to tropical rainforests. There are over 10,000 known species of birds, ranging in size from tiny hummingbirds to large ostriches. They are adapted to a wide range of feeding habits, including carnivorous, herbivorous, and omnivorous diets. Birds are also known for their unique songs, which they use for communication and mate attraction. They play important ecological roles, such as pollination, seed dispersal, and pest control. Many species of birds are also kept as pets or hunted for food or sport.

A letter is a written or printed message that is typically sent from one person to another. It can be formal or informal and is often used for communication when a direct conversation is not possible. Letters are usually written on paper, but they can also be sent digitally through email or messaging platforms. They may convey personal thoughts, official information, requests, or invitations. Traditionally, letters were delivered by post or courier services, but with advancements in technology, electronic letters have become more common due to their speed and convenience.

The Internet is a global network that connects millions of computers and devices, allowing them to communicate with each other and share information. It enables users to access websites, send emails, watch videos, play games, and use various online services. The Internet relies on a system of servers, routers, and protocols to ensure that data travels efficiently between devices across the world. It has become an essential tool for communication, education, business, and entertainment, shaping modern life in countless ways.