Marine echinoderms with five arms extending from a central disc are commonly known as sea stars or starfish. These fascinating creatures are part of the phylum Echinodermata, which also includes sea urchins, sand dollars, and sea cucumbers.

Sea stars are known for their unique radial symmetry, with their arms radiating out from a central point. They are found in oceans all over the world, from shallow coastal waters to the deep sea. Sea stars come in a variety of colors and sizes, with some species growing up to three feet in diameter.

One of the most interesting features of sea stars is their ability to regenerate lost limbs. If a sea star loses an arm due to a predator or injury, it has the amazing ability to grow a new one. This regenerative ability has fascinated scientists for years and has made sea stars the subject of numerous studies.

In addition to their regenerative capabilities, sea stars are also important members of marine ecosystems. They play a crucial role in controlling populations of mollusks, barnacles, and other invertebrates, helping to maintain the balance of marine ecosystems. Sea stars are voracious predators, using their tube feet to pry open shells and feed on their prey.

Unfortunately, sea stars are facing numerous threats in today's oceans. Pollution, habitat destruction, and climate change are all taking a toll on sea star populations. In recent years, a mysterious disease known as sea star wasting syndrome has decimated populations of sea stars along the west coast of North America.

Despite these challenges, sea stars continue to capture the imagination of people around the world. Their unique appearance and behavior make them a popular subject for marine enthusiasts and researchers alike. Whether you're exploring tide pools along the coast or diving in the deep sea, keep an eye out for these fascinating creatures with five arms extending from a central disc – the remarkable sea stars.

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