Which distinctively-shaped invertebrate has bony, calcified skin

Which distinctively-shaped invertebrate has bony, calcified skin, and is known for its regenerative powers?

Step 1: Introduction to the inquiry "1. What is the name of the invertebrate with a unique shape, possessing a skeleton made of calcified bone, and renowned for its regenerative abilities?"

...1. Sea star 2. Lobster 3. Crab 4. Cricket Commonly referred to as a starfish in the past, the sea star is a fascinating creature that can be found in all of the world's oceans. While the most prevalent type has five arms, there have been instances where sea stars with twenty or even forty arms have been discovered. The sea star's remarkable capacity for regeneration stems from the fact that most of its organs are situated within its arms. Thus, as long as its central disc remains intact, the sea star has the ability to regenerate.

Step 2: Response to the query "1. What is the name of the invertebrate with a unique shape, possessing a skeleton made of calcified bone, and renowned for its regenerative abilities?"

The invertebrate in question is known as a sea star.

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