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The endothelium is the layer of cells lining the blood vessels in animals. It weighs more than one kilogram in adult humans, and it covers a surface…
EndotheliumTissuesEpitheliumCellsVascular endotheliumIn eighteenth century Germany, Johann Friedrich Blumenbach studied how individuals within a species vary, and to explain such variations, he proposed…
AnthropologyAnatomy, ComparativeVariation (Biology)EmbryosDevelopmental BiologyEctoderm is one of three germ layers--groups of cells that coalesce early during the embryonic life of all animals except maybe sponges, and from…
EmbryosEmbryologyGastrulationCellsTissuesMesoderm is one of the three germ layers, groups of cells that interact early during the embryonic life of animals and from which organs and tissues…
MesodermGastrulationCell differentiationCellsTissuesEndoderm is one of the germ layers-- aggregates of cells that organize early during embryonic life and from which all organs and tissues develop.…
GastrulationEmbryosEmbryologyCellsTissuesA germ layer is a group of cells in an embryo that interact with each other as the embryo develops and contribute to the formation of all organs and…
GastrulationEmbryologyCell differentiationEmbryosCellsTo study human evolution, researchers sometimes use microstructures found in human teeth and their knowledge of the processes by which those…
EvolutionteethDental EnamelFossilsHuman EvolutionBetween February 1969 and August 1970 Edward Kollar and Grace Baird, from the University of Chicago in Chicago, Illinois, published three papers that…
teethEmbryosCell differentiationMesenchymeEpitheliumTooth enamel contains relics of its formation process, in the form of microstructures, which indicate the incremental way in which it forms. These…
EvolutionteethDental EnamelHuman EvolutionAnatomyHilde Proscholdt Mangold was a doctoral student at the Zoological Institute at the University of Freiburg in Freiburg, Germany, from 1920-1923.…
LiteratureEmbryosTrembley, Abraham, 1710-1784GastrulationEmbryology