What could I take out/add/replace to make this shorter? A particular atom will have the same number of protons and electrons. Most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. A compound is a substance made from two or more different elements that have been chemically joined. Water's extensive capability to dissolve a variety of molecules has earned it the designation of universal solvent, and it is this ability that makes water such an invaluable life-sustaining force. On a biological level, water's role as a solvent helps cells transport and use substances like oxygen or nutrients. The 4 main categories of biological (organic) molecules are carbohydrates, nucleic acids, proteins, and lipids. All four of those types of molecules contain carbon, hydrogen, and oxygen.

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.