Fish poop.
Tropical white beaches get their pearly white color from the excrement of fish far off of the coast which eat coral and other things that reside on the ocean floor. When they eat they swallow some sand into their mouths as well, and process it with the food they just ate. Their stomachs can't really digest the sand, tiny minute rocks essentially, and thus turn their color white. Or the rock forming the sand can be naturally pigmented a whitish tone as well.
Body organs can be interrelated with other organisms since they are somehow morphologically and physiologically the same.
1. Brain, the brain for most animals are the same, serves the function the same and acts for the many functions of an organism, similarly. This vital organ plays on action-response behavior, management and primal survival instinct, although somehow it's different in structure from the other organisms.
2. Stomach, is an organ wherein the food that is taken in from mouth or opening of a cavity is stored for a short time and is prepared for digestion and metabolic process in the digestive tract or G.I. tract.
Prokaryote and eukaryote both have cell membranes
