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Evidence of the emergence of embryophyte land plants first occurs in the middle Ordovician (~ 470 million years ago ), and by the middle of the Devonian (~ 390 million years ago ), many of the features recognised in land plants today were present, including roots and leaves.
Feb 16, 2012 · The world's lush profusion of photosynthesizers—from towering redwoods to ubiquitous diatoms—owe their existence to a tiny alga eons ago that swallowed a cyanobacteria and turned it into an...
Jun 18, 2024 · The evolutionary history of plants is recorded in fossils preserved in lowland or marine sediments. Some fossils preserve the external form of plant parts; others show cellular features; and still others consist of microfossils such as pollen and spores.
Mar 1, 2023 · The origin of the first photosynthetic eukaryotes through to the first land plants transformed the Earth's biosphere. There is no single unified view of the processes and timing of early plant evolution despite myriad fossil and geochemical evidence.
The earliest terrestrial plants lived during the Middle Ordovician around 470 million years ago, based on their fossils found in the form of monads and spores, with resistant polymers in their outer walls, from Turkey, Saudi Arabia and Argentina.
Jun 18, 2024 · Plant, any multicellular, eukaryotic, usually photosynthetic life-form in the kingdom Plantae. There are an estimated 390,900 different species of plants known to science. Learn more about the plant kingdom, including the life and evolutionary histories and physical characteristics of the major plant groups.
Sep 4, 1997 · The origin and early evolution of land plants in the mid-Palaeozoic era, between about 480 and 360 million years ago, was an important event in the history of life, with...
Jun 28, 2024 · Botany, branch of biology that deals with the study of plants, including their structure, properties, and biochemical processes. The principles and findings of botany have provided the base for such applied sciences as agriculture, horticulture, and forestry.
May 18, 2018 · Evolution of Plants. Modern classification systems, based largely on molecular evidence, divide living organisms into three domains: Bacteria (also called Eubacteria), Archaea, and Eukarya. Plants are classified as a kingdom (Plantae) within the Eukarya; organisms that possess a nucleus , mitochondria , an internal cytoskeleton , and, in ...
The study of plant evolution attempts to explain how the present diversity of plants arose over geologic time. It includes the study of genetic change and the consequent variation that often results in speciation , one of the most important types of radiation into taxonomic groups called clades .
