Public domain photos

The image shows a close up of a polyp, a type of coral, next to a ruler on a table. The polyp is a light brown color and has a textured surface. The ruler is a standard measuring tool used to measure the size of the polyp.

The image shows a close up of a polyp, a type of coral, next to a ruler on a table. The polyp is a light brown color and has a textured surface. The ruler is a standard measuring tool used to measure the size of the polyp.Open in library