Algae are photosynthetic organisms that own photosynthetic pigments including chlorophyll. But, they lack real roots, stems, and leaves characteristic of vascular vegetation. Some of them are unicellular whereas others are multicellular. They may also shape colonies. Maximum algae are aquatic. Others are terrestrial and can be determined on moist soil, timber, and rocks. Some algal species form symbiosis with other organisms. As an example, a lichen...
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Nature