In a specimen-based viva, the examiner describes this case: a prepared sponge slide shows needle-like mineral elements supporting the body. Choose the concept that fits it best.

Spicules are skeletal elements made of calcium carbonate or silica in many sponges. They provide support and protection and are important in sponge identification. This MCQ belongs to the Porifera topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.