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Sponge

Adapted from Wikipedia · Explorer experience

Colorful marine sponges growing underwater in the Caribbean Sea, Cayman Islands.

Sponges

Sponges are interesting animals that live in the water. They are called Porifera, which means "pore bearer" because they have many tiny holes. Most sponges live in the sea, attached to the seabed. They have been around for a very long time and help build reefs where many sea creatures live.

Sponges are made of many cells that can change and move. They do not have systems for nerves, digestion, or blood flow like other animals. Instead, they use water to get food and oxygen. Water moves through their bodies with tiny hair-like structures called flagella on special cells.

Scientists think sponges might be one of the earliest types of animals. Fossils of early sponges have been found that are about 800 million years old. The study of sponges is called spongiology.

The word "sponge" comes from an ancient Greek word spóngos. The scientific name for sponges is Porifera, which means "pore bearing" in Latin. This name describes the many tiny holes in a sponge's body.

Sponges are simple animals that live mostly in the ocean. They stay in one place and have many tiny holes that let water flow through them. This water brings food and oxygen to the sponge. Sponges have a soft, jelly-like middle layer surrounded by thin layers of cells. Most sponges stay on the sea floor their whole lives.

Sponges are important in the ocean. They can work with tiny plants that make food from sunlight, helping make extra oxygen. Some small shrimp live inside sponges and help protect them. Sponges also host many tiny microbes that live with them and help make important substances.

Images

A close-up of a pink stove-pipe sponge, a type of sea sponge found in the waters of Haiti.
A scientific illustration showing choanoflagellate cells and their flagella, helping to explain how these tiny organisms move and feed.
Diagram showing different body structures of sponges, with color labels for various cell types and water flow.
A freshwater sponge, Spongilla lacustris, found in the Hanford Reach of the Columbia River in Washington State.
Chart showing how deep different sponge species live in the ocean.
A delicate glass sponge known as Euplectella aspergillum, found deep underwater near Davidson Seamount off the coast of California.
A close-up of a clam shell showing natural growth patterns and small holes made by sea sponges—a great example of how ocean life interacts with shells!
A scientific diagram showing how different marine animals and plants are connected in a sponge reef food web.
A diagram showing how sponges help recycle nutrients in coral reefs by absorbing and processing organic matter from corals and algae.
A diagram showing the different cell types found in a sponge, helping us learn about aquatic life!
A colorful diagram showing the different parts of a calcifying sponge, including cells and structures, to help learn about marine biology.
A natural sea sponge (Spongia officinalis) found in the ocean.
The Venus' Flower Basket is a beautiful deep-sea sponge with a delicate, lattice-like structure.

Related articles

Oxygen
Seabed

This article is a child-friendly adaptation of the Wikipedia article on Sponge, available under CC BY-SA 4.0.

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