4.Qualified individual with a disability, the single cell algae which hold in the area with the water flow. Because of the water flow has both oxygen, carbon dioxide and nutrient circulation, good lighting, algae, they will come to grip., as well as the cyanobacteria to stick together. Some groups hold in wet areas, some groups are in the water, the แตกต่างกันออกไป colors. Depending on whether there is any moss seaweed group elements.
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