Archaeplastida is a major group of eukaryotic organisms that includes red algae, green algae, and land plants. This group is characterized by the presence of plastids, which are organelles that originate from an endosymbiotic event with a cyanobacterium. Archaeplastida plays a vital role in photosynthesis and the ecology of various habitats, showcasing the evolutionary significance of this lineage in the diversification of photosynthetic organisms.
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