6.4.1 Paleontological evidences

. . Paleontological evidences Paleontology is the study of prehistoric life through fossils. Fossils are described as the true witnesses of evolution or documents Boiling water Tungsten electrode Spark discharge Flask Gaseous mixture (CH + NH + H + H O) Water out Condenser Cold water in Aqueous medium containing organic compounds Tap for withdrawing sample Fig. . Diagrammatic representation of Urey-Miller’s experiment XII Std Biology-Zoology Chapter- XII Std Biology-Zoology Chapter- Evolution homologous structures that brings about divergent evolution (Fig . ). Similarly the thorn of Bougainvillea and the tendrils of Curcurbita and Pisum sativum represent homology. The thorn in former is used as a defence mechanism from grazing animals and the tendrils of latter is used as a support for climbing.