Question

grow to substantial sizes, with diameters reaching up to 6 feet. demosponges play important roles in marine ecosystems and contribute significantly to the overall biodiversity of sponge species. which class of sponges is the largest and most diverse? calcareademospongiaehexactinellids

Explanation:

Demospongiae is the largest and most diverse class of sponges, playing important roles in marine ecosystems and contributing to sponge - species biodiversity as described in the text.

Answer:

B. demospongiae