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The five kingdom system may be combined with the two empire system. In the Whittaker system, Plantae included some algae. In other systems, such as Lynn Margulis's system of five kingdoms, the plants included just the land plants (Embryophyta), and Protoctista has a broader definition. [12]
Land plants evolved from a group of freshwater green algae, perhaps as early as 850 mya, [3] but algae-like plants might have evolved as early as 1 billion years ago. [2] The closest living relatives of land plants are the charophytes, specifically Charales; if modern Charales are similar to the distant ancestors they share with land plants, this means that the land plants evolved from a ...
Botany (Greek Βοτάνη (botanē) meaning "pasture", "herbs" "grass", or "fodder"; [2] Medieval Latin botanicus – herb, plant) [3] and zoology are, historically, the core disciplines of biology whose history is closely associated with the natural sciences chemistry, physics and geology.
Phylogenetic and symbiogenetic tree of living organisms, showing the origins of eukaryotes and prokaryotes. The two-empire system (two-superkingdom system) was the top-level biological classification system in general use from the early 20th century until the establishment of the three-domain system (which itself is currently being challenged by the two-domain system).
Agriculture was the main economic activity in ancient Mesopotamia.Operating under harsh constraints, notably the arid climate, the Mesopotamian farmers developed effective strategies that enabled them to support the development of the first known empires, under the supervision of the institutions which dominated the economy: the royal and provincial palaces, the temples, and the domains of the ...
After a contentious five-hour public meeting, environmentalists advocates have persuaded Inland Empire officials to delay development of a project within 400 feet of one of the oldest known plants ...
[17] [29] These terraces also helped to insulate the roots of plants during cold nights and hold in the moisture of the soil, keeping plants growing and producing longer in the high altitudes. [17] [29] Tipón was a location in the Inca Empire that was an estate for Inca nobles.
The Columbian exchange, also known as the Columbian interchange, was the widespread transfer of plants, animals, and diseases between the New World (the Americas) in the Western Hemisphere, and the Old World (Afro-Eurasia) in the Eastern Hemisphere, from the late 15th century on.