Plants are mostly multicellular organisms, predominantly photosynthetic eukaryotes from the kingdom Plantae, which would exclude fungi and some algae. Plant cells have been derived by endosymbiosis of the cyanobacterium into an early eukaryote about a person billion years in the past, which gave rise to chloroplasts.[133] The primary many https://directivepublications.org/the-journal-of-radiation-oncology/