The thin, spiny structure that form the skeleton of a sponge

The spicules are the thin and spiny structure that forms the skeleton of a sponge. The spicules provide the structural support and they are small needle-like in a shape. The spicules consist of calcium carbonate and silicon dioxide. It is found in many sponges of the skeleton, they are basically like crystals and they have a pointed and hard and sharp body. Like animals, the sponges also posses some sort of skeleton which gives shapes to their body. The skeletal system of the sponge is like a needle or cluster in shape.

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.

telophase and anaphase