Definition: An apicarpell, also known as an alga, is a type of algae that resembles a sponge-like structure but has a cylindrical shape and is often found in aquatic environments. It is characterized by its unique, hard, and tough outer shell made up of microspines or spines, which are typically arranged in rows perpendicular to the surface. The apicarpell's cells are sessile, meaning they grow without a cell wall, allowing them to survive in conditions that would be
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