Consider the following periods of geological time scale (i) Permian (ii) Triassic (iii) Jurassic (iv) Cretaceous (v) Devonian Link with the following events in flora and fauna A. Flowering plants proliferate. Monotremes, marsupials and placental mammals appear. Break up of Gondwana B. Gymnosperms (especially conifers and cycads) and ferns common. First birds and lizards. Atmospheric CO2 levels 4 – 5 times the present day levels C. First mammals and crocodilia appear D. Landmasses unite into supercontinent Pangaea, 95% of life on earth becomes E. First clubmosses, horsetails and ferns appear, as do the first seed-bearing plants (progymnosperms) First amphibians still aquatic
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