BIO 3102 Study Guide - Saurischia, Living Dinosaur, Radula

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11 Jul 2014
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Innovations of moving up on land and could be turned into the antlers, hair or even nails. Lost their shells in the mesozoic era, because they were having difficulty swimming. Laying eggs in which the embryo develops outside the mothers body and then hatches: oviparous animals are amniote animals, example birds and reptiles. In seed plants, gives rise to the female reproductive cells and contains the female reproductive cells: contains the outer layer, the megasporangium and the megaspore in its centers. The mega gametophyte produces the egg for fertilization: after fertilization, the ovule develops into a seed, pangaea, during the early mesozoic era, all the land masses drifted towards each other and formed the supercontinent pangaea. It started to drift apart during the early middle jurassic period. Include the overwhelming majority of the phylum chordata, with currently about 64,000 species described. Vertebrates include the jawless fishes, bony fishes, sharks and rays, amphibians, reptiles, mammals, and birds.