EVERYDAY SCIENCE

Detailed explanation-1: -The demosponges comprise 95% of the world’s sponges and include the most colourful species. They range in size from small, encrusting forms, through to large irregular masses. They have spicules (tiny needle-like structures that support the body’s form) of silica dioxide and/or spongin.

Detailed explanation-2: -Included are the yellow tube sponge, Aplysina fistularis, the purple vase sponge, Niphates digitalis, the red encrusting sponge, Spiratrella coccinea, and the gray rope sponge, Callyspongia sp.