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Brief account of evolution, ●, , Stages in the evolutionary history of earth, , ●, , 1. Paleozoic era: Age of Amphibians, , ●, , 2. Mesozoic era: Age of Reptiles, , ●, , 3. Coenozoic era: Age of Mammals, , SHINE KODAKKATTUPARAMBIL@NAROKKAVU H S S
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Paleozoic era, ●, ●, , Age of amphibians, Silurian period : First appearance of terrestrial, animals, , ●, , Devonian period: Golden age of fishes, , ●, , Carboniferous period:, , ●, , Permian period:, , SHINE KODAKKATTUPARAMBIL@NAROKKAVU H S S
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Mesozioc era, ●, , Age of reptiles, , ●, , Triassic period :, , ●, , Jurassic period:, , ●, , Cretaceous period:, Dinosaurs extinct, , SHINE KODAKKATTUPARAMBIL@NAROKKAVU H S S
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2000 million years ago[mya], ●, , First cellular forms of life appeared on earth, , ●, , Some release O2, , ●, , Light reaction occurs, , ●, , Split water by solar energy, , ●, , Single cell --> multicellular form, , SHINE KODAKKATTUPARAMBIL@NAROKKAVU H S S
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●, , 65 mya:Dinasaurs suddenly disappeared from the, earth, , ●, , Reasons:, , ●, , Climatic changes, , ●, , Some may evolved into birds, , ●, , First mammal- like shrews, , SHINE KODAKKATTUPARAMBIL@NAROKKAVU H S S
