Brown algae, belonging to the phylum Phaeophyta, are a diverse group of photosynthetic organisms primarily found in marine environments, particularly in colder waters. They are characterized by their brown or olive-green color, which is due to the presence of the pigment fucoxanthin, along with chlorophyll a and c. Brown algae vary in size, ranging from small filaments to large kelps that can grow to several meters in length.
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