This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
FMIB Spongia oculata showing the orifices and currents outwards.jpeg Spongia oculata showing the orifices and currents outwards Anastomosing horny substance of Spongia communis Siliceous spiculum of papillaris Of Scineria Pasons Calcareous spiculum of compressus Transverse section of canal of papillaria showing the structure