Marine plants are a diverse group of organisms that inhabit the world's oceans and seas. They range from microscopic algae to large KELP forests, and provide food and shelter for many marine animals. The four crossword solutions for the term marine plant are ALGA (4 letters), KELP (4 letters), SEAWEED (7 letters), and Seasedge (8 letters). ALGA is a type of aquatic photosynthetic organism, usually single-celled or multi-cellular, which can range from microscopic to macroscopic sizes. KELP is a type of large brown SEAWEED that grows in cold, shallow waters and is an important part of many coastal ecosystems. SEAWEED is a general term for any type of macroscopic, multicellular, marine plant, including both brown and green algae. Seasedge is a type of grass-like plant found in shallow, intertidal areas of the ocean.