Seaweed are forms of algae and are marine plants. There are three basic types of seaweed, brown, green and red. Brown seaweed has about 5000 different species, green seaweed has about 800 species and red seaweed has about 2000 species. Seaweed is attached to the bottom of the ocean by holdfasts. They provide shelter and food sources for many species within the ocean. Some species of seaweed can grow several meters in length or be very tiny. They stay a float with tiny gas/air pockets. Seaweed an be found in all of the worlds oceans and is usually located in sandy bottoms or attached to rocks in intertidal zones. Seaweed is not considered a plant because it lacks the specialized vascular system. Like plants, seaweed is photosynthetic, converting energy form the sun into energy. Seaweed contains chlorophyll and seaweed can also contain other light absorbing pigments like red, blue, brown or golden, which provides the pretty colouration seen in red and brown seaweeds. Seaweed is not only beneficial in the ocean. It is used as medicines and eaten by humans and sometimes used as fertilizer.
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