Structure found in nature
An egg!!
The egg is a biological structure intended by nature for reproduction. It protects and provides a complete diet for the developing embryohis. The egg shell, called the chorion , is often sculptured with microscopic grooves or ridges that may be visible only under the high magnification of an electron microscope. The chorion is perforated by microscopic pores (called aeropyles ) that allow respiratory exchange of oxygen and carbon dioxide with relatively little loss of water.