Marine algae, also known as SEAWEED, is a type of algae that grows in the ocean. It is typically found in shallow, coastal waters and can range in size from microscopic to over 200 feet long. Marine algae are an important part of the marine ecosystem, providing food and shelter for many species of fish and other marine life. They also play an important role in the global carbon cycle, absorbing carbon dioxide from the atmosphere and releasing oxygen into the water.