Regardless of their size, all octopods have some things in common. They don't have bones or shells. In fact their bodies are so soft that they can slip into narrow cracks to hide from enimes and watch for prey.
The Octopus
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The Octopus
Another organism that has tentacles is the octopus. Marine biologists study the many different types of octopods. One small species of octopus grows to only 5cm (2inch)long, but a giant octopus reachs 5.4m(18ft) long and its tentacle arms can stretch 9m(30ft) across.
Regardless of their size, all octopods have some things in common. They don't have bones or shells. In fact their bodies are so soft that they can slip into narrow cracks to hide from enimes and watch for prey.
Regardless of their size, all octopods have some things in common. They don't have bones or shells. In fact their bodies are so soft that they can slip into narrow cracks to hide from enimes and watch for prey.
A Coral Reef
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A Coral Reef
If you went scuba diving to study a coral reef, you would see a wonderland of shapes and colors. The reef itself is a rough ridge built from the hard body coverings of corals and other organisms. Hundreds of animals grow on the reef, hide in it, hunt around it, and swim past it. You might see crabs,sharks,jellyfish, and sponges.
You would certainly see coral animals. One end of a coral polyp's body makes calcium. The calcium builds up in to a stony cup around the polyp has either six or eight tentacles, depending on the type of coral.
If you went scuba diving to study a coral reef, you would see a wonderland of shapes and colors. The reef itself is a rough ridge built from the hard body coverings of corals and other organisms. Hundreds of animals grow on the reef, hide in it, hunt around it, and swim past it. You might see crabs,sharks,jellyfish, and sponges.
Clownfish
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Clownfish
If you were a marine biologist, you would learn about sea organisms. You might study the way clownfish and sea anemones help keep each other alive.
Clownfish are small and defenseless. Even when they are fully grown, they are only about 13cm(5inch) long.
If a clown fish swims around in a reef, it is in great danger of being eaten by a large fish or another organism. It needs a safe place to hide.
Anemones look like flowers, but they are actually kind of a animal called a polyp. A polyp has a soft, simple body shaped like a bag that is open at one end, with tentacles areound the opening.
Clownfish are small and defenseless. Even when they are fully grown, they are only about 13cm(5inch) long.
If a clown fish swims around in a reef, it is in great danger of being eaten by a large fish or another organism. It needs a safe place to hide.
Anemones look like flowers, but they are actually kind of a animal called a polyp. A polyp has a soft, simple body shaped like a bag that is open at one end, with tentacles areound the opening.
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