Answer :
Some seaweeds are microscopic, such as the phytoplankton that live suspended in the water column and provide the base for most marine food chains.
Seagrasses serve a variety of purposes, including stabilising the ocean floor. supplying other aquatic species with food and a home. preserving the quality of the water. The only blooming plants that can thrive in saltwater conditions are seagrasses. About 60 species of totally marine seagrasses exist, and they are all members of the order Alismatales and come from the four families Posidoniaceae, Zosteraceae, Hydrocharitaceae, and Cymodoceaceae (in the clade of monocotyledons).The 72 different varieties of seagrass are often grouped into the Zosteraceae, Hydrocharitaceae, Posidoniaceae, and Cymodoceaceae families. Their various sizes, forms, and functions in marine habitats are reflected in their common names, which include eelgrass, turtle grass, tape grass, shoal grass, and spoon grass.
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