Describe the structure of multicellular algae (ulotrix kelp red algae)?

Algae are eukaryotes. Algae are an informal grouping of primitive, mainly aquatic plants that possess chlorophyll as their main photosynthetic pigment and can produce their food through photosynthesis. The algae body (thallus) has no true roots, stems, leaves, vascular tissue and has simple reproductive structures. They never produce multicellular embryos inside the female reproductive organ. In fresh waters (for example, lakes and rivers), unicellular (for example, plankton) and multicellular (for example, seaweed) algae, marine and terrestrial, are found.