Which of the following describes non-algae plants? a genus of large brown seaweed that floats Island-like masses, called beds, and is common waters off the U. S. South Atlantic coast types of marine plankton in which half of the species are photosynthetic and the rest are exclusively heterotrophic seagrasses which exist in the shallow coastal regions that are somewhat in nature because they have adapted to the salt content of ocean water Oa type of single-celled phytoplankton that lives ubiquitously throughout the upper strata of the ocean