The beautiful sea stars (“starfish”), classified as echinoderms, are one of the most easily identifiable marine invertebrates, with their characteristic radiating arms and stony skin of calcium carbonate. The sea star’s water vascular system is one of the more amazing and complex arrangements in the animal world.

The element nitrogen is critical in the living world. It is a basic building block of structural and regulatory proteins, nucleic acids, and chlorophyll in plants. God created the nitrogen metabolic networks found in people and various living organisms.

ICR's March 2025 wallpaper is now available for mobile, tablet, and desktop! Download this month's image for free by clicking the format option links below and saving the files to your device.

Two recent studies by different groups have concluded essentially the same thing: there are mysterious cold rock slabs at the bottom of Earth’s mantle that cannot be explained by conventional theories.^1,2 Geophysicists typically color these colder rocks blue, as shown in the image.